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【单选题】
Directions: In this section, you will hear some short conversations. At the end of each conversation, one question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C, and D, and decide which the best answer is.A.
The teacher is really strict.
B.
The teacher likes his students.
C.
It is easier than people thought.
D.
It is very hard to pass the exam.
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【简答题】从效率的观点来看,机械的自锁条件是____________________。
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