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为什么有些反应的活化能很接近，反应速率却相差很大；有些反应的活化能相差较大，而反应速率却很接近？

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Complete the following sentences with the words given below. Change the form where necessary. (Unit 1, Text A)assurebiaseddreadgrinhoverscrawlvisible1. He me that the well-known doctor would cure my headache.2. I wish you’d stop round and let me get on with some work.3. Hilary was out, so I a note to her and put it under the door.4. In the room where the young man was killed, detectives found no signs of a struggle.5. One member of the jury was in favour of the suspect, because they shared the same educational background.

Choose the definitions from Column B that best matches each phrasal verb in Column A, paying attention to the v.+prep./ad. Collocation. (Unit 1, Text A & Text B)

以下不是单片机特点的是【】。

A. 存储容量小
B. 价格低廉
C. 控制简单
D. 主频高、速度快

设X=52H,Y=33H,则X与Y“或”运算结果为【】。

A. 73H
B. 12H
C. 87H
D. 85H