题目内容
【题目】----______ we clean the blackboard at once ?
----No, you _____ . You_____ clean it after class.
A. Must; needn’t; may B. Must; mustn’t ; can
C. Shall ; can’t must D. Need; mustn’t ; may
【答案】A
【解析】句意：——我们必须马上擦黑板吗？——不，你们不必了。你们可以在课下擦它。must必须，表示要求；needn’t不必，表示要求；may可以，表示允许；mustn’t禁止；can能，表示能力。Shall应，表示建议；can’t不可能，表示有把握的推测。Need需要，表示必要性。
由need引出的一般疑问句，肯定回答常用must或have to;否定答语常用needn't. 由must引出的一般疑问句，肯定回答用must,否定答语用needn't或don't have to。故排除BD两项。Shall we do sth？=Let’s do sth.表示建议做某事，肯定回答为Yes, we shall.否定回答为No ,we shouldn’t.故选A。
阅读快车系列答案【题目】Each summer, you hear news that some sports players are sent to hospitals because it is too hot. Our bodies can’t be outside in the sun for a long time. So in hot summers, be careful about playing sports outside.
Firstly, to play sports safely in hot weather, you must drink water. Sports drinks are great for athletes, but they have so much sugar that they’ll dehydrate（使脱水）you more. However, drinking a
few bottles of sports drinks will be good for you.
Secondly, be sure to take enough breaks to let your body rest. If your coach doesn’t let you do so in the heat, don’t wait until you feel uncomfortable. Just be honest with your coach when you need breaks.
Thirdly, when you have a break, don’t sit in the sun. With the sun beating down on you, you’ll only heat up and sweat（冒汗）more. Take a seat under a tree, or even better, go indoors for a little while.
Cooling yourself down can help you stay active longer.
Fourthly, remember that the earlier in the day you start your exercise, the cooler it will be. If you can start practice before the sun comes up, you have a few good hours to practice in the cool hours of the morning. Also, the earlier you practice, the earlier you can finish the exercise. If you need more practice time, come back to the field later in the evening when the sun is setting.
Last but not least, you should watch your food. Eat food which is high in water, starch（淀粉）and
carbohydrate(糖类), but be sure to get a good balance in your diet.
As long as you pay attention to the above, playing sports safely in the heat isn’t a difficult thing.
How to keep 【1】when playing sports in summer | |
Facts | Some people do exercise 【2】 in the sun for long in hot summer. Some sports players are sent to hospitals because the【3】is too high. |
【4】 | Drink water and play sports safely. But too many bottles of sports drinks may do 【5】to you. Take enough 【6】 during summer exercise. When you feel uncomfortable, let your coach know right now. 【7】sit in the sun when you have a rest. You’d better sit under a tree or go indoors for a while, which may help you keep active longer. Choose a proper time for practice. Remember to exercise as【8】 as possible to enjoy exercising on cool summer mornings. Sunset is a good choice as well. Be careful with your【9】and have a balanced diet. |
Conclusion | The more you pay attention to the【10】 , the safer you will be while playing outside in the heat! |