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[单选题]
—I’ve told Nancy many times about the meeting, but she still forget it!
—understand. Actually, anyone ______ be very forgetful at times.(1分)
A
must
B
need
C
ought to
D
can
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参考答案
试题答案：
D
答案解释：
解题思路： 考查情态动词的用法 根据句意 表示可能性 ，只有can 能表示此意。must 必须 need 需要 ought to 应该
相关题目
23.5 When mother found me buying the things the family in great need, she felt____ .(2分)
be considered to do 表示“被认为做某事”，没有 be considered doing 这种结构，排除B、C项。而建立（found）这一动作发生在主语谓语 be considered 之前，故用完成形式，排除D项。故正确答案为A。It was weird that _______, the more sleepy I seemed to get.(1分)
23.2 Which of the following was NOthe permanent feature of the street the writer was walking down?____(2分)
To get married first and then get a job is putting the cart before the______.(1分)
It is curious how children always behave much worse when they are____ holiday.
The chairman____ a question for discussion.
3. Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
21.3 A strange feature of the umbrella’s use is that it was used as__________.(2分)
21.5 Mothers go out and earn money to sustain family resources at the cost of____.(2分)
Peter felt very____ when everyone laughed at his question.
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