单项选择题

Observations were made ______ the children at the beginning and at the end of preschool and first grade.

A. towards
B. of

C. on

D. at
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单项选择题
The fifth generation computers, with artificial intelligence, ______ and perfected now.
A. developed


B. have developed
C. are being developed

D. will have been developed
单项选择题
In the southwestern part of the United States ______ built in the last century.
A. there are many abandoned mining towns
B. were many abandoned mining towns
C. where there are many abandoned mining towns
D. where are many abandoned mining towns
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