单项选择题

Visitors on a tourist visa can undertake English study for up to ______.

A．three months
B．six months
C．one year
D．three years
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单项选择题
According to the passage, new technologies are likely to influence ______.
A．the extent of competition
B．people’s spending power
C．attitudes to advertising
D．the way people shop
单项选择题
It is implied in the passage that ______.
A．many industrialists feel no concern for the improvement of pollution control
B．breathing low concentrations of urban dust does not necessarily sicken or kill people
C．no acceptable biological mechanism has been suggested to explain the toxicity of low concentration of urban dust
D．scientists have done nothing to reveal the mystery of the toxicity of low concentration of urban dust
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