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A．He often cuts classes to play basketball.B．He has no chance to play basketball.C．He'
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W: Really？ You do deserve a great holiday. You did a great job. Where are you going？
M: I'm planning to visit New Mexico. How about it？
W: My sister and I had the vacation there last year and we had a great time.
M: Did you get into Albuquerque？
W: Sure. We were skating all the time. I really love skating.
M: Is it far from the mountains？
W: Not at all. Even though Albuquerque is on the high plateaus, there are even high mountains near it. Just half an hour away from the city there is a snow-covered slope.
M: Well. As the mountains are just thirty minutes away, I guess I should take my ice skate and my skis.
W: Definitely. You'll need them.
M: I heard that the weather there is great.
W: It is. No humidity, moderate temperatures, but you do need to be careful about high altitude.
M: High altitude... What should I do about that？
W: Oh, just take it easy for a few days. Don't go hiking up to the mountains or exercise too vigorously. Just do everything gradually. You'll get used to it soon.
M: I'm sure I will be fine. And I will let you know all about my trip when I come back.
(20)
听力原文： Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. In fact, insects have been eating plants for as many as 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
(33)
A．He should try a better and convenient way.B．He should give up looking for the book.C
清朝敕封西藏喇嘛教首领的意义在于()。
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