Annealing
Annealing is a way of making metal softer by heating it and then letting it cool very slowly, if metal is heated and then cooled very quickly, for example by dipping(浸) it in water, it will be very hard but also very brittle(脆)—that is, it will break easily. Metal that has been annealed is soft but does not breaks as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other material, such as glass.
1. Annealing can make metal ____
A. hard and tough(韧) B. hard but brittle C. soft but tough D. soft and brittle
2. Why do people put hot metal in water?
A. To make it hard. B. To make it soft. C. To make it cool. D. To make it brittle
3. In annealing, the required hardness of a metal depends on ______
A. the quantity of water used B. the temperature of the metal
C. the softness of the metal D. the timing of the operation
4. As suggested by the text, how can glass be made less brittle?
A. It can be heated and then cooled quickly.
B. It can be cooled and then heated slowly.
C. It can be heated and then cooled slowly.
D. It can be cooled and then heated quickly.
(2013·全国Ⅰ，A)
Some people will do just about anything to save money. And I am one of them. Take my family's last vacation. It was my sixyearold son's winter break from school, and we were heading home from Fort Lauderdale after a weeklong trip. The flight was overbooked, and Delta, the airline, offered us $400 per person in credits to give up our seats and leave the next day. I had meetings in New York, so I had to get back. But that didn't mean my husband and my son couldn't stay. I took my ninemonthold and took off for home.
The next day, my husband and son were offered more credits to take an even later flight. Yes, I encouraged—okay, ordered—them to wait it out at the airport to “earn” more Delta Dollars. Our total take: $1,600. Not bad, huh?
Now some people may think I'm a bad mother and not such a great wife either. But as a bigtime bargain hunter, I know the value of a dollar. And these days, a good deal is something few of us can afford to pass up.
I've made a living looking for the best deals and exposing (揭露) the worst tricks. I have been the consumer reporter of NBC's Today show for over a decade. I have written a couple of books including one titled Tricks of the Trade: A Consumer Survival Guide. And I really do what I believe in.
I tell you this because there is no shame in getting your money's worth. I'm also tightfisted when it comes to shoes, clothes for my children, and expensive restaurants. But I wouldn't hesitate to spend on a good haircut. It keeps its shape longer, and it's the first thing people notice. And I will also spend on a classic piece of furniture. Quality lasts.Why did Delta give the author's family credits?
| A．They took a later flight. |
| B．They had early bookings. |
| C．Their flight had been delayed. |
| D．Their flight had been cancelled. |
What can we learn about the author?
| A．She rarely misses a good deal. |
| B．She seldom makes a compromise. |
| C．She is very strict with her children. |
| D．She is interested in cheap products. |
What does the author do?
| A．She's a teacher. |
| B．She's a housewife. |
| C．She's a media person. |
| D．She's a businesswoman. |
What does the author want to tell us?
| A．How to expose bad tricks. |
| B．How to reserve airline seats. |
| C．How to spend money wisely. |
| D．How to make a business deal. |
The law of overlearning explains why cramming (突击学习) for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.What is the author's opinion on cramming?
| A．It leads to failure in college exams. |
| B．It's helpful only in a limited way. |
| C．It's possible to result in poor memory. |
| D．It increases students' learning interest. |
Much later that night, the question of why I'd stopped for that light came back to me. I think I stopped because it's part of a contract(契约)we all have with each other. It's not only the law, but it's an agreement we have, and we trust each other to honor it: we don't go through red lights.
Trust is our first inclination(倾向)．Doubting others does not seem to be natural to us. The whole construction of our society depends on mutual(相互)trust, not distrust. We do what we say we'll do; we show up when we say we'll show up; and we pay when we say we'll pay. We trust each other in these matters, and we're angry or disappointed with the person or organization that breaks the trust we have in them.The event made the author strongly believe that________.
| A．traffic rules may be unnecessary |
| B．doubting others is human nature |
| C．patience is important to drivers |
| D．a society needs mutual trust |
If left alone outside, dogs and cats can be very smart in their search for warm shelter. They can dig into snow banks or hide somewhere. Watch them closely when they are left outdoors, and provide them with shelter of good quality. Keep an eye on your pet's water. Sometimes owners don't realize that a water bowl has frozen and their pet can't get anything to drink. Animals that don't have clean and unfrozen water may drink dirty water outside, which may contain something unhealthy for them....If pets are left on their own outdoors in cold weather, they may ________.
| A．run short of clean water |
| B．dig deep holes for fun |
| C．dirty the snow nearby |
| D．get lost in the wild |
For her first garden, Ms. Feeley has put in 15 tomato plants, and five rows of a variety of vegetables. The family's old farm house has become a chicken house, its residents arriving next month....What does the word“residents” in Paragraph 1 probably refer to?
| A．chickens | B．tomatoes |
| C．gardens | D．people |