Beautyisonlyskindeep.Thisexpre-优题课

None of our early ancestors could digest milk as adults because their bodies never had to ----milk drinking simply wasn’t an option. As people began to extract milk from animals, though, some people developed the ability to keep drinking it throughout their lives.
Scientists now know of a milk-related mutation ( 变异) in our genes -- the chemical instructions for life that we carry in almost every cell in our bodies. People who have a mutated form of one particular gene can drink milk just fine. People without the mutation tend to get sick from milk.
To figure out where, and possibly why, milk drinking started, some scientists have been looking at who has the milk-digesting mutation today. Patterns are striking.
Most adults in Northern and Central Europe are able to digest milk -- and they do. Cheese and butter and other dairy products are popular in countries such as Sweden, Denmark, Germany and England. Because European settlers dominated North America, most people here can handle milk just fine, as well. That may explain why ice cream is such a popular dessert in the United States.
In much of Africa, Asia and South America, on the other hand, people tend to avoid dairy products because they lead to diarrhea (腹泻) and other stomach problems. (That’s why you won’t typically find cheese on the menu at a Chinese, Japanese or Ethiopian restaurant.) Native
Americans are also unable to digest milk.
Based on these genetic patterns, scientists have long thought that- milk drinking started inNorthern Europe, where dairy is an institution and the milk-digesting mutation is everywhere.
A recent study painted a different picture. With a computer medal, Thomas and colleagues looked at the spread of the milk-drinking mutation, farming and other related factor. Working backward, the scientists concluded that the first milk-thinkers lived in Central Europe around what’s now Hungary about 7,500 years ago. The practice didn't start farther north, as scientists had thought before.
66. Which of the following is the proper order of events according to the passage?
a. Their children were able to digest milk as adults.
b. They got sick from the milk.
c. Some people got a mutation in their genes.
d. Some people tried drinking milk from animals.
e. Some people started to drink milk from animals on a regular basis.
A. c→d→b→e→a B. d→e→b→c→a C. d →b→e→c→a D. e→d→b→c→a
67. Most people in the USA can digest milk because __________.
A. they have strong stomachs B. their ancestors were Europeans
C. that’s where milk drinking stintedD. farmers raise a lot of cows there
68. Which of the following is LEAST likely to appear on the menu in a Japanese restaurant?
A. Butter. B. Vinegar. C. Fish. D. Beef.
69. Which of the following is the author most likely to agree with?
A. Milk drinking first started in Northern Europe.
B. Milk drinking first started in Central Europe.
C. North American Indians were able to digest milk.
D. Dairy products are very popular in North Korea.
70. The main focus of the scientists' research was ______________.
A. mutation of human genes B. development of the human stomach
C. why milk drinking started D. where milk drinking first started

In the year 480 BC the Greek allies (联军) faced invasion by the King of Persia, Xerxes, who commanded a huge army of about half a million men. When the Persian army marched into northern Greece, the Greek states, led by Athens and Sparta, were ill equipped to deal with the threat. The Persians were well supplied with food and weapons. Their army included infantry, cavalry, and a large navy. It seemed that they would easily defeat the Greeks.
The Greek allies decided to send 10,000 men northwards to slow down the Persians, while the rest prepared to defend their homelands. A group of 300 best Spartan soldiers were chosen to lead the force going north, with Leonidas in command. Leonidas realized that the only hope of slowing the Persians would be to block the narrow passage of land at Thermopylae. The Pass of
Thermopylae was the route between the mountains and the sea, and was so narrow that only a few men could get through at a time.
When the Persian army arrived at Thermopylae, they found Leonidas' tiny army opposing them. The Persians attacked, but could not get through. They attacked again and again, but each time they were driven back by the Greeks, led by the fearless Spartans. Leonidas' plan worked well until a Greek traitor called Ephialtes went m Xerxes. He told the Persian king about a goat's path in the mountains that would take the Persian army past Thermopylae. When Leonidas saw the enemy crossing the mountains, he realized that he could no longer hold Thermopylae. He sent all the Greek soldiers except the 300 Spartans back to their homelands.
The Spartans waited for the 500,000 Persians at the goat’s path. Although hopelessly outnumbered, the Spartans fought bravely. They all died, but the other Greeks were able to get home to strengthen the defenses.
61. Compared with the Persian army, the Greek allies were very________.
A. powerful B. wise C. weak D. foolish
62. The Pass of Thermopylae was very important for the Greeks because __
A. it was easy to hold but hard to attack
B. only very small boats could get through it
C, it was a secret pass unknown to the Persians
D. a huge number of soldiers could be stationed there
63. Why did Leonidas send most of his soldiers back to their homelands?
A. Because their homelands were under attack.
B. Because he found they were not brave enough.
C. Because the Persians gave up attacking Thermopylae.
D. Because he found it impossible to hold Thermopylae.
64. Which of the following is NOT ture according to the passage?
A. Leonidas was a great commander.
B. The Persians failed to pass Thermopylae.
C. Ephialtes betrayed his own country.
D. The 300 Spatans would be regarded as heroes by the Greeks.
65. Which of the following would be the best title for the passage?
A. The Greek Allies B. The Goat’s Path C. The King of Persia D. Xerxes and Ephialtes

Nick Campbell sat at the side of the road and wondered what to do next. He looked at the second-hand Harley Davidson he’d bought from a back-street garage back home in Miami at the beginning of his trip six weeks before.
For years he had dreams of crossing the United States from east to west by motorbike and he’d finally decided that it was now or never. He’d given up his job, sold his car and set off for the journey of his dreams. He’d been lucky, or so he thought, to find this old Harley Davidson and had bought it for a very reasonable price------it had cost him just $600. But five kilometers from Atlanta, he had run out of luck. The motorbike had broken down.
He pushed the bike into town and found a garage. The young mechanic told him to leave the bike overnight and come back the next day. The following morning, to his surprise, the man asked if the bike was for sale. “Certainly not,” he replied, paid his bill and hit the road.
When he got to Kansas the old machine ran out of steam again. This time Nick thought about selling it and buying something more reliable, but decided to carry on. When the bike was going well, he loved it.
However, in Denver, Colorado the bike broke down again so he decided to take it to a garage and offer it for sale. The mechanic told him to come back in the morning.
The next day, to his amazement, the man offered him $2,000. Realizing the man must be soft in the head, but clearly not short of money, Nick asked for $ 3,000. The man agreed and they signed the papers. Then the mechanic started laughing. In fact it was several minutes before he could speak and when he could he said, “That’s the worst deal you’ll ever make, boy."
He removed the seat. On the underside was the inscription (铭文):
'To Elvis, love James Dean. '
56. Harley Davidson here refers to a _________.
A. car B. truck C. garage D. motorbike
57. Which of the following did Nick value most?
A. Harley Davidson. B. His job. C. His dream to travel. D. His car.
58. Nick was unwilling to sell his Harley Davidson because he thought it was
A. lovely B. valuable C. reliableD. old
59. The underlined word ~ hi the 6th paragraph is closest in meaning to
A. clever B. crazy C. honest D. kind
60. At the end of the story, Nick must have felt very __________.
A. sorry B. delighted C. excited D. moved

Do you wake up in the morning dreading the moment that your feet have to hit the floor for you to get ready for work? If that’s the case, join most of Americans. Very few people wake up to that annoying alarm clock and spring out of bed excited about having to go to work.
As if that were not enough, most of us have to fight traffic getting there, usually an hour’s drive. Then, when we get to work, we have to fight with unruly co-workers or a nagging boss. And to make matters worse, you have to fight the same traffic going in the opposite direction just to get back home.
Making dinner, fixing plates, eating and then straightening up afterwards is a job within itself. If that sounds like your life, you probably have a J-O-B. you know what J-O-B stands for? Just Over Broke, that’s what! With a job, most Americans are living paycheck-to-paycheck and hating every minute of it. I know because I was doing the same thing: trading time for money. And, I came to a conclusion that it stinks (糟糕透了)! Big time!
Looking around at my co-workers, friends and relatives, I saw that they were all doing the same thing I was doing. They were complaining about the same things I was complaining about : not having enough time or money. And, I decided that I wanted to do something different.
So, I started a home-based business. There are several to choose from. The extra income has done so much for our family. We can vacation more. We have been able to give more. And, we’ve even been able to do something calling save! It’s been amazing.
Therefore, if you’re sick and tired of being sick and tired, it’s time you make a change, too. The definition of insanity (疯狂) is doing the same thing over and over and expecting different results. I know you aren’t stupid. If you continue to do what everyone else is doing: trading time for money, you’re going to keep getting what everyone else is getting: being broke and not having the time to do what is really important to you.
Do your due diligence. Find a home-based business that works well for you. Go to work, and live the life you’ve always imagined!
According to Paragraph 1, which of the following statements is TRUE about most Americans?

A．Most Americans are excited to go to work every day.

B．Most Americans are used to sleeping in the morning.

C．Most Americans are tired of having to go to work every morning.

D．Most Americans have alarm clocks to wake them up in the morning.

By writing the first three paragraphs, what feeling does the writer express?

A．Regret.

B．Joy.

C．Pride.

D．Dissatisfaction

What does “something different” in Paragraph 4 refer to?

A．To set up a business at home.	B．To complain about life and work.
C．To spend more time on holidays.	D．To resign from the former job and get a new one.

In the atmosphere , carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.
According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere(半球), possibly resulting in an alteration of the earth’s chief food growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have gone beyond those caused by man. The question is: Which natural cause has most effect on the weather?
One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot sports and ‘cold” spots( that is, the relatively less hot spots) on the sun. As the sun rotates(使旋转), every 27.5 days, it presents hotter or colder faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth’s atmospheric pressure, and consequently on wind circulation. The sun is also changeable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is hot. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(惯性) of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun’s fading heat.
It can be concluded that concentration of carbon dioxide in the atmosphere would ____.

A．mean a warming-up in the Arctic.

B．raise the temperature of the earth’s surface.

C．prevent the sun’s rays from reaching the earth’ s surface.

D．explain the cause of great changes in the climate in the northern hemisphere.

The article was written to explain____.

A．the greenhouse effect.	B．the solar effects on the earth.
C．the causes affecting weather.	D．the models of solar weather of solar weather interactions.

Although the fuel consumption is greater in the northern hemisphere, temperature there seems to be falling. This is ____.

A．mainly because the levels of carbon dioxide are rising

B．partly due to changes in the output of solar energy

C．possibly because the ice caps in the poles are melting

D．only due to the effect of the inertia of the earth’s climate

On the basis of their models, scientists are of the opinion that .

A．the climate of the world should be becoming cooler

B．the new Ice Age will be delayed by the greenhouse effect

C．the man-made w

arning effect helps to increase the solar effects

D．it will take thousands of years for the interia of the earth’s climate to take effect.

If the assumption about the delay of a new Ice Age is correct, ___.

A．ice would soon cover the northern hemisphere.

B．the greenhouse effect could work in favor of the earth.

C．the best way to overcome the cooling effect would be to burn more fuels.

D．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly.

A．Unsupportive.	B．Casual.
C．Responsible.	D．Positive.