单项选择题

What effects the amount of carbon-14 on earth ()

A. The lifecycle of trees
B. The number of trees
C. The intensity of solar burning
D. The quality of air.

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问答题
Laughter helps you reduce muscle tension, release anger, improve your ability to overcome panic and bring anxiety under control, as well as keep a more positive mind.
单项选择题
The author intends to tell the readers that ().

A. the United States is a wealthy country although poverty and crime exist there.
B. crime has become a serious problem in the United States, although it is said to be a prosperous one.
C. despite the fact that crimes have been increasing rapidly in the United States, it is a Country of prosperity.
D. in spite of stories about poverty and crime in the United States, it is prospering at an Increasing rate.

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