21（）A.it B.they C.he D.she

The doctor suggests that a person （） exercises every da...

单项选择题The doctor suggests that a person （） exercises every day if he wishes to be healthy.

A. does
B. did
C. do
D. will do

It is implied in the passage that a competent child （）A...

单项选择题It is implied in the passage that a competent child （）

A. does what he is told
B. plays with other children
C. can perform certain task
D. tells other children what to do

The main idea of the passage is（）A. even Americans are ...

单项选择题The main idea of the passage is（）

A. even Americans are surprised at the big differences among themselves
B. there are many differences in character in different parts of the USA
C. there are many reason for the differences
D. stereotypes about people are not necessarily true