( )是指较大较隆重的场合，为表示敬重和友好而举行的规范化、_爱下问搜题

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问题单项选择题

( )是指较大较隆重的场合，为表示敬重和友好而举行的规范化、程式化的仪式。

A．礼节

B．礼貌

C．礼仪

D．礼俗

答案

参考答案：C

判断题

对于伺服进给类型，采用开环控制、步进电机进给系统为中、高挡数控机床。

完形填空

We have known for a long time that flowers of different plants open and close at different times of day. This is so 1 that there seems to be no need to ask the reason for it. Yet no one 2 understands why flowers open and close like this at particular times. The process is not as 3 as we might think, as recent experiments have shown. In one study, flowers were kept in constant 4 . We might expect that the flowers, without any information about the time of day, did not open as they 5 do. As a matter of fact, they 6 to open at their usual time. This suggests that they have some mysterious(神秘的) way of k

nowing the    7  . Their sense of time does not    8   information from the outside world; it is, so to speak, inside them, a kind of “inner clock”.
This    9   may not seem to be very important. However, it was later found that not just plants but also    10  , including man, have this “inner clock” which    11   the working of their bodies and influences their activities. Men, then, are also influenced by this mysterious    12  . Whether we wish it or not, it affects such things in our life as our need for sleep, our need for food.
In the past, this did not really    13   because people lived in natural condition. In

the 14 world, things are different; now there are spacemen, airplane pilots and, in ordinary life, a lot of people who have to work at night. It would be very 15 , then, to know more about the “inner clock”. Such things as flowers might help us understand more about ourselves.