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What will owners of solar homes not worry about

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
What is one Of the difficulties in Carrying out a world-wide birth control program
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.
单项选择题
What does the man suggest the woman do
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.
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