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问题 选择题

如下图所示，横轴Q表示劳动力供给，纵轴P表示工资水平。AS为劳动力供给实际变化曲线。当AD1右移至AD3时，就会出现劳动力过剩向短缺的转折点，即所谓的“刘易斯转折点”。目前中国已经进入劳动力总供给曲线(AS)的上升阶段，这意味着我国(　　)

A．劳动力价格普遍上涨，经济增速放缓

B．应调整产业结构，发展战略性新兴产业

C．企业应该改善用工条件，提高劳动待遇

D．企业生产成本增加，生产规模急剧缩小

答案

答案：C

目前中国已经进入劳动力总供给曲线(AS)的上升阶段，表明劳动力将由过剩转向短缺，故应该改善用工条件，提高劳动待遇，因此C项符合题意。A、B、D三项不构成直接的因果关系。

单项选择题

王刚是某高校的著名学者，他也擅长弹钢琴。其实，很多学者都擅长弹钢琴，有的还是著名的钢琴演奏家。王刚曾经在一所综合性大学里接受过正规的大学教育。由此可知，( )

A．王刚只有接受正规的大学教育，才能成为知名学者

B．只有知名学者才可以成为钢琴演奏家

C．只有从正规的大学毕业的学生才可能会弹钢琴

D．有些学者也可以成为钢琴演奏家
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单项选择题

It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too.
The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding.
Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them.
Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation.
To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

Which of the following statements is true

A. Scientists have solved the mystery about the fish killer.
B. More studies need to be made about the fish killer.
C. It is proved that the algae are reducing fish populations.
D. Humans have already been affected by the toxin.
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