单项选择题

A. 3 and 7.
B. 7 and 9.
C. 3 and 9.
D. 3 and 13.
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单项选择题
A. They pollute the atmospheric environment.B. They produce dangerous gases.C. They stop the sun’s heat from reaching the earth.D. They cause global warming.
A. They pollute the atmospheric environment.
B. They produce dangerous gases.
C. They stop the sun’s heat from reaching the earth.
D. They cause global warming.
单项选择题
A. A daytime Mandarin Chinese course. B. An evening Japanese course. C. A weekend English course. D. A full time Japanese course.
A. A daytime Mandarin Chinese course.
B. An evening Japanese course.
C. A weekend English course.
D. A full time Japanese course.
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