单项选择题

The origin of language ______.

A. is reflected in sounds and letters
B. is handed down from generation to generation
C. dates back to the prehistoric period
D. is a problem not yet solved

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单项选择题

What did the supermarket promise its customers

A. Free shopping for all customers.

B. Free shopping for all customers on a certain day.

C. Free shopping for one customer.

D. Free shopping for one customer once a week.

单项选择题

A. Travel. B. Read some books. C. Do a part-time job. D. Write a comment.

A. Travel. B. Read some books.
C. Do a part-time job. D. Write a comment.