单项选择题

Increase in the temperature of tropical soil ______.

A．might cause the overflow of flood
B．may lead to the loss of organic nitrogen in it
C．will produce a great deal of organic nitrogen
D．is harmless to the growth of rain forests

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热门试题

单项选择题

From this passage we can infer that the author's attitude toward the theory of some geologists (Line 3, Para. 1) is ______.

A．approval
B．disapproval
C．indifference
D．displeasure

单项选择题

The 15 plates of the Earth are formed from ______.

A．the oceanic crusts and continental crests
B．the crusts and the mantle
C．the crusts and the top and solid part of the mantle
D．the continental crusts and the solid part of the mantle