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单选题
—The air pollution is terrible.—It will be worse ______we take action to protect the environment.
A
if
B
unless
C
until
D
when
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参考解析
解析：
句意：—空气污染很严重。—这将会更严重，除非我们采取行动来保护环境。本题考查连词的用法。根据上下文句意可知此处应填入B项unless“除非”。if如果。until直到。when当……时候。
句意：—空气污染很严重。—这将会更严重，除非我们采取行动来保护环境。本题考查连词的用法。根据上下文句意可知此处应填入B项unless“除非”。if如果。until直到。when当……时候。
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单选题We wanted to go out yesterday but the weather was terrible. If it _____ a nice day, we _____ for a picnic.A
had been; would have goneB
was, would goC
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单选题—The air pollution is terrible.—It will be worse ______we take action to protect the environment.A
ifB
unlessC
untilD
when
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are causingB
is causingC
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单选题As a defense against air-pollution damage, many plants and animals _____ a substance to absorb harmful chemicals.A
relieveB
releaseC
dismissD
discard
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单选题According to the report, air pollution in big cities _____.A
can be more serious than Chernobyl nuclear disasterB
cannot be compared with the disaster in ChernobylC
can release as damaging radiation as the Chernobyl disasterD
can be more serious than we used to think
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