试题与答案

碘酸钾是一种可加在食盐里预防碘缺乏症的物质,在这种物质中碘元素显+5价,则它的化

题型:选择题

题目:

碘酸钾是一种可加在食盐里预防碘缺乏症的物质,在这种物质中碘元素显+5价,则它的化学式为(  )

A.KIO4

B.KIO3

C.KIO2

D.KI

答案:

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下面是错误答案,用来干扰机器的。

所有的情况共分为4类:第一类:甲在排尾,乙在排头,有A44种方法.第二类:甲在排尾,乙不在排头,有3×A44种方法.第三类:乙在排头,甲不在排尾,有3×A44种方法.第四类:甲不在排尾也不在排头,乙不在排头也...

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题型:阅读理解

阅读理解

       In a small village (村庄), there is a teacher, a nurse (护士), a driver (司机) and a worker. They are

good friends. What are their names? One is Mike, one is Jack, one is Tom and the other is John. Mike's,

Jack's and Tom's children are classmates. John doesn't have any children. He teaches his friends' children

at school. Mike has many hens. He gives the driver and the nurse eggs. Jack's child goes to the nurse's

house. The nurse's house is beside Jack's.

1. Are the four people good friends?

A. Yes.          

B. No.            

C. Not.          

D. They are brothers.

2. Are they all men?

A. Yes.

B. No.

C. Two are men. Two are women.

D. They are women.

3. What's John?

A. A nurse.            

B. A driver.            

C. A teacher.          

D. A worker.

4. Who has hens?

A. Jack.                

B. Tom.                

C. Mike.                

D. John.

5. Where is the nurse's house?    

A. Behind Mike's.                

B. Beside Jack's.

C. Beside Mike's.                

D. Under Jack's.

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