单项选择题

______ you ______ further problems with your printer, contact your dealer for advice.

A．If, had
B．Have, had
C．In case, had
D．Should, have
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单项选择题
A bad snoring can cause all of the following EXCEPT______.
A．heart failure
B．brain misfunction
C．failure in breathing
D．failure to get enough sleep
单项选择题
Which of the following statements is true, according to the passage
A．Acid deposition kills the trees, birds and animals in a direct way.
B．Acid rain causes not only global warming but also more other effects.
C．Acid rain, though adverse, is one of the advantages industry brings us.
D．Acid rain is adverse only because it releases carbon or sulfur dioxide, and others.
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