单项选择题

The main topic of the passage is ______.

A. conditions in the work place
B. the freedom of industries in the past
C. changes in industrial production
D. the safety and health of workers and customers

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单项选择题

When you have a bank account, you ______.

A. must always be in credit
B. can't draw any money if you're overdrawn
C. can draw money without notice
D. can't pay money to anyone else

单项选择题

According to one theory, when the glaciers disappeared, birds ______.

A. stopped migrating
B. continued migrating
C. began migrating again
D. migrated south and stay there