一、 单项选择（15小题，每题 1分，共计15分）
1. Simon usually plays_______ guitar on Sunday morning and plays_______ chess on Sunday afternoon.
A. the; the B. the; ／ C.／;the D. /:／
2. Chinese students must_______ their hands first and then _______ to speak in class.
A. raise; rise B. raise; raise C. rise; rise D. rise; raise
3. _______ he is very young, _______ he knows a lot about how to be healthy.
A. Though; but B. Although; but C.／;but D. Although;／
4. We carefully compared the result of the first experiment with _______ of the second one.
A. it B. that C. the ones D. this
5.- Could you tell me_______？
- Every four years.
A. how often the Olympic Games take place
B. when the Olympic Games are held
C. how often are the Olympic Games held
D. how often the Olympic Games were held
