单项选择题

A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.
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单项选择题
A．It remained almost unchanged.B．It was going up slowly.C．It was decreasing.D．It was increasing.
A．It remained almost unchanged.
B．It was going up slowly.
C．It was decreasing.
D．It was increasing.
单项选择题
A．He feels medical treatment is still unproven for his condition.B．He is worried about the side effects of the drugs.C．He thinks the treatment is too expensive.D．Ha doesn’t believe drugs are effective.
A．He feels medical treatment is still unproven for his condition.
B．He is worried about the side effects of the drugs.
C．He thinks the treatment is too expensive.
D．Ha doesn’t believe drugs are effective.
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