填空题

The scientists have discovered that ___________________ (这种物质的反应速度是那种物质的3倍).

【参考答案】

this substance reacts three times as fast as that one.
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单项选择题
A．He believes the Browns have done a sensible thing.B．He doesn’t think the Browns should move to another place.C．He doesn’t think the Browns’ investment is a wise move.D．He believes it is better for the Browns to invest later.
A．He believes the Browns have done a sensible thing.
B．He doesn’t think the Browns should move to another place.
C．He doesn’t think the Browns’ investment is a wise move.
D．He believes it is better for the Browns to invest later.
单项选择题
The author’s tone in this passage is ______.
A．sympathetic
B．doubtful
C．critical
D．objective
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