单项选择题

A. The disadvantages of solar energy.
B. The pollution of other energy sources.
C. The rising fuel costs and fuel shortage.
D. The costs of solar energy system.

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单项选择题
A. Those who want to be teachers and interpreters.B. Those who want to be interpreters and tour guides.C. These who want to be secretaries and teachers.D. Those who want to be tour guides and teachers.
A. Those who want to be teachers and interpreters.
B. Those who want to be interpreters and tour guides.
C. These who want to be secretaries and teachers.
D. Those who want to be tour guides and teachers.
单项选择题
A. Alone by themselves. B. With their mother. C. With their father. D. Part of the time with mother, the other with their father.
A. Alone by themselves.
B. With their mother.
C. With their father.
D. Part of the time with mother, the other with their father.
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