题目内容

下列离子中,中心原子采取不等性杂化的是( )。

A. H3O+
B. NH4+
C. PCl6-
D. BI4-

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I have a.

A. computers
B. computer
C. a computer
D. two computers

There are manyin our school.

A. student
B. studen
C. studet
D. students

June 1st isDay all over the world.

A. Child’s
B. Childs’
Childrens’
D. Children’s

The tall man with big nose is _______ teacher.

A. Tom and Carl
B. Tom and Carl’s
C. Tom’s and Carl’s
D. Tom’s and Carl

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