单项选择题

A．It’’s author is unknown.
B．It’’s useful as a teaching tool.
C．It uses an extensive vocabulary.
D．Children find it repetitive and boring.
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单项选择题
A．Begin breathing through the nostrils.B．Slow down somewhat, but continue straining.C．Stop the particular exercise at once.D．Close his mouth immediately.
A．Begin breathing through the nostrils.
B．Slow down somewhat, but continue straining.
C．Stop the particular exercise at once.
D．Close his mouth immediately.
单项选择题
A．Because the hot air has to reach a certain temperature.B．Because the house is very big.C．Because termites try to escape by hiding in wooden beams.D．Because termites may survive for a full six hours.
A．Because the hot air has to reach a certain temperature.
B．Because the house is very big.
C．Because termites try to escape by hiding in wooden beams.
D．Because termites may survive for a full six hours.
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