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阅读理解。

    One morning an old man left his house with six donkeys (驴). After a while (过了一会儿), he got tired

and got on one of them.He counted (数) the donkeys and there were only five. So he got off (下来) and

went to look for the sixth. He looked and looked, but he did not find it, so he went back to the donkeys

and counted them again. To his surprise (令他惊讶的是), this time there were six. So he got on one of

them again and they started. After a few minutes, he counted the donkeys again and again there were only

five!He became confused (困惑的). Just then a friend of his passed him. The old man said to him, "I left

my house with six donkeys. Then I had five, then I had six again, and now I have only five! One, two,

three, four, five." 

    "But," said his friend, "you are sitting on a donkey, too. This is the sixth. And you are the seventh!"

1.When did the story happen (发生)? [ ]

A.In the morning

B.In the afternoon

C.In the evening

D.At night

2.In fact, how many donkeys were there? [ ]

A.Four

B.Five

C.Six

D.Seven

3.Why did the old man get on one of the donkeys? [ ]

A.Because he wanted to count them

B.Because he got tired

C.Because he wanted to look for the sixth

D.Because he became confused

4.Why couldn't the old man get the right number? [ ]

A.Because he left one at his house

B.Because he gave one of the donkeys to his friend

C.Because he didn't see one of the donkeys

D.Because he forgot to count the one he got on

5.The old man was very            .[ ]

A.kind

B.foolish (愚蠢的)

C.smart

D.surprised

一次风有两个主要控制量，即磨煤机一次出口风温和一次风（）。

氟牙症多见于恒牙，乳牙者甚少，是因为（）

A.胎盘屏障

B.8岁以后生活在高氟区

C.刷牙时吞服含氟牙膏

D.氟骨症的表现

E.以上都不对

单位面积上的内力称为（），用公式表达为应力＝外力/外力作用面积。

简述西晋户调制的主要内容。