Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.

When will overseas students enroll

Why is it necessary to give a coin to someone when you ...

单项选择题Why is it necessary to give a coin to someone when you give him a present with a sharp edge or point

Employees today work shorter hours but take longer vaca...

判断题Employees today work shorter hours but take longer vacation than in 1979.