单项选择题

According to the passages acid rain _________.

A．adds minerals to the grain
B．travels with the prevailing westernly wind
C．leads to birth defects in fish
D．and its formation have been fully understood

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热门试题

单项选择题The least serious damage caused by acid rain is _________.

A．poisoning of plant roots
B．leaching of heavy metals
C．changing the blood chemistry in
D．corrosion of metal structures

单项选择题Why do the French workers prefer to be out of work rather than working just a few hours a day

A．Because they are willing to earn less money.
B．Because they have some measure of financial security.
C．Because the unemployment program pays them enough money.
D．Because there is nothing they can do about the situation.