单项选择题

Passage One

A. The level of education varies around the world.
B. The economists’ attitudes to population differ greatly.
C. The living standard varies from country to country.
D. The countries’ attitudes to population differ greatly.
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单项选择题
A. Show the add drop form to Professor Smith.B. Go on attending Professor Smith’s class.C. Come to the registration office with the form.D. Sort out the problem all by herself.

A. Show the add/drop form to Professor Smith.
B. Go on attending Professor Smith’s class.
C. Come to the registration office with the form.
D. Sort out the problem all by herself.
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.

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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