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问题 单项选择题

（十三）气候异常是当今人类面临的重大环境问题，它严重威胁与影响人类的生存和生活。

全球气候变暖的趋势会导致（）。

①欧亚大陆的冰川后退

②太平洋部分岛屿逐渐消失

③北美中高纬小麦减产

④影响东亚的台风数量减少

A.①②

B.②③

C.③④

D.①④

答案

参考答案：A

单项选择题

少寐多梦，梦则遗精。阳事易举，心中烦热，头晕目眩，口苦胁痛，小便短赤，舌质红。苔薄黄，脉弦数。可辨证为（）

A.湿热下注

B.劳伤心脾证

C.肾气不固证

D.气血两虚

E.君相火旺证
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单项选择题

Which of the following statements about speculators and hedgers in the futures market is TRUE()

A. Hedging can allow a business to guard against a price increase in a commodity without sacrificing profit if the commodity price decreases. 

B. Hedgers guard against market price changes that would cause a reduction in their operating profit. 

C. A speculator would use futures to take a short position in a commodity if its price is expected to increase.
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