DiscoverNewsmagazineofscienced-优题课

Leaves are nature’s food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide (CO2) from the air. Plants use sunlight to turn water and CO2 into glucose（葡萄糖）.Glucose is a kind of sugar. Plants use glucose as food for energy to grow. The way plants turn water and CO2 into glucose is called photosynthesis (光合作用).That means “putting together with light .” A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is green. It gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees “know” to begin getting ready for winter.
During winter, there is not enough light or water for photosynthesis .The trees will rest, and live on the food they have stored during the summer. They begin to close their food-making factories. The green Chlorophyll disappears from the leaves. Then, we begin to see yellow and orange colours. A few of these colors stay in the leaves all the time. We just can’t see them in the summer, because they are covered up by the green Chlorophyll.
Red and purple colors we see in leaves are made mostly in the autumn. In some trees, like maples, glucose is stored in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn turn this glucose into red. The brown color of trees like oaks is made from wastes left in the leaves.
The underlined word “chlorophyll” in the first Para meansin Chinese.
A叶绿素 B 氧气 C 胡萝卜素 D 蛋白质
The wayis called photosynthesis.

A．plants get CO2 from the air

B．plants take water from the ground

C．plants turn water and CO2 into glucose.

D．Plants use glucose as food for energy to grow.

The gas called carbon dioxide is from the
A ground B roots C air D sunlight
Which of the following is not true?

A．when autumn and winter come, the days get shorter and shorter.

B．During winter trees rest and live on the food they store during the summer.

C．During winter small amounts of yellow and orange colors are kept in the leaves all the time.

D．Trees begin to stop making food in summer.

In the past, when people had problems, they went to their families or friends to get advice.
Today it is possible to get advice from radio shows, TV programmes and telephone hot lines, too. A hot line is a telephone line that offers a direct way of getting in touch with advisers .Most hot lines are completely anonymous ,that is to say , callers do not have to say their names or telephone numbers. Most hot lines are usually free. Callers do not have to pay for the advice or the phone calls, even if the calls are long distance ones. At some hot lines, the advisers are volunteers. Other hot lines pay their advisers for their work. Usually the advisers are full-time people with years of education and experience, but sometimes, the advisers have only taken a short training before starting to work on the hot lines. All the advisers listen to people and help them solve their problems.
The underlined word “anonymous” in the passage meansin Chinese.

A．secret

B．well-known

C．exact

D．wonderful

When people call the hot line advisers, they .

A．often give their names and telephone numbers

B．generally have to pay for the long distance calls

C．usually pay nothing for most of the calls and advice

D．always try to get in touch with the volunteer advisers

The advisers working at hot lines .

A．have all been trained for a short time

B．are all volunteers

C．have all received years of education

D．are not all paid

The writer of the passage seems to think that .

A．hot lines help the callers a lot

B．advisers will solve all of the callers’ problems

C．people had better pay for the advice

D．people will not get advice from their families or friends

The first newspapers were handwritten sheets which were posted in pubic places．The earliest recorded newspaper was started in Rome in 59 BC．In the 700’s the world’s first printed newspaper was developed in China．The paper was printed from carved wooden blocks and sent out among the citizens．Europe didn’t have a regularly published newspaper until 1609, when one was started in Germany.
The fist regularly published newspaper in the English language was printed in 1620．In 1621, an English newspaper was started in London and was published weekly．The first daily English newspaper was the Daily Courant, which didn’t appear until March 1702.
In 1690, Benjamin Harris printed the first American newspaper in Boston．But the local government soon stopped its publication．In 1704, John Campbell started The Boston News-letter, the first newspaper to be published daily in America．By 1760, the whole America had more than thirty daily newspapers．There are now about 1800 daily papers in the United States.
Today, as a group, English language newspapers have the largest circulation in the world．The largest circulation for a newspaper, however, is that of the Japanese newspaper Asahi Shimbun, which sells over eleven million copies every day.
In Europe, the newspaper was first regularly published_____.

A．in England	B．in Germany
C．in France	D．in London

The first English newspaper printed and sold every day appeared _________.

A．in 1620	B．in 1609
C．at the end of the 17^th century	D．at the beginning of the 18^th century.

How many years earlier was the newspaper printed in China than in America?

A．9 or 10 centuries．

B．More than 1000 years.

C．700 years or so

D．Less than 800 years.

Which title best gives the main idea of the passage?

A．The World’s First Newspaper.

B．History of Newspaper.

C．The First Daily Newspaper in American.

D．A Remarkable Man-Benjamin Harris.

For more than six million American children, coming home after school means coming home to an empty house. Some deal with the situation by watching TV. Some may hide. But all of them have something in common. They spend part of each day alone. They’re called latchkey children. They’re children who look after themselves while their parents work and their bad condition has become a subject of concern（关心）。
Lynette Long was once the principal（校长）of an elementary school. Said, “We had a school rule against wearing jewelry. A lot of the kids had chains around their necks with keys attached（附带）。 I was often telling them to put them inside their shirts. There were so many keys that it never came to my mind what they meant.” Slowly, she learned they were house keys.
She and her husband began talking to the children who had them. They learned of the effect working couples and single parents had on their children Fear is the biggest problem faced by children at home alone. One in each three latchkey children the Longs talked to reported being scared（害怕）.Many had nightmares and were worried about their own safety.
The most common way latchkey children deal with their fears is by hiding. It might be in a shower stall, under a bed, in a closet. The second is TV. They’ll often play it high volume.
It’s hard to get statistics（统计数字）on latchkey children, the Longs learned. Most parents are slow to admit they leave their children alone.
The main idea about “latchkey” children is that they ______.

are growing in numbers
are also found in middle-class neighborhoods
watch too much TV during the day
suffer problems from being left alone

Which sentence in the second paragraph is the topic sentence?

We had a school rule against wearing jewelry.
A lot of kids had chains around their necks.
I was often telling them to put them inside their shirts.
She learned they were house keys.

The main feeling these children have when they are at home by themselves is ______.

A．tiredness

B．freedom

C．loneliness

D．fear

The word “nightmare” in the third paragraph probably means______.

A．night suit	B．night habit
C．terrible dream at night	D．staying up at night

We may draw a conclusion that_______.

latchkey children enjoy having such a large amount of time alone
latchkey children try to hide their feeling
latchkey children often watch TV with their parents
it’s difficult to find out how many latchkey children there are

The following table shows some results of a survey （调查）in which 800 Japanese school pupils were asked to give their impressions（印象）of their classroom teachers. The pupils’ impressions were found to differ depending on whether the teacher was new (with less than three years’ experience), middle-standing(ten to twenty years), or veteran（有经验的）（twenty to thirty years）. The numbers in the table show the percentage of the pupils who answered “very satisfied” or “extremely satisfied” for each question item （项目）

Question Items	New	Middle-standing	Veteran
1.Shows sense of humor in class 2.Explains clearly 3.Teaches in a relaxed（放松的）manner. 4. Writes neatly on the blackboard 5. Lets pupils ask questions in class 6. Makes checks in notebooks 7. Speaks loudly and clearly 8. Treats pupils equally 9. Cares about pupils opinions 10. Spends time with pupils between classes	42 33 30 9 18 22 45 43 47 25	56 58 46 43 30 30 85 58 43 10	70 68 65 56 47 43 54 42 17 6

In contrast（对比）to the new teachers, the middle-standing and veteran teachers seem to have made a remarkable（显著的）improvement in their ability to _______.

A．be fair to any pupil	B．evaluate pupils’ progress
C．present materials clearly	D．understand and play with pupils

Pupils seem to regard the new and the middle-standing teachers as being more_____.

A．relaxed in class than the veterans

B．interested in pupils’ ideas than the veterans

C．neat in appearance than the veterans

D．skilful at explaining than the veterans

Which of the following statements is true according to the table?

In the new teachers’ classes, pupils seem to ask questions more freely.
Pupils seem to be quite satisfied with the amount（量）of time their teachers spend with them between classes.
The evaluation of the middle-standing teachers is lower than that of the veterans in seven items.
Though veterans do not play games with pupils during breaks, their teaching is rated highly.

A．Wired and Instyle	B．Discover and Instyle
C．Self and Discover	D．Self and Wired