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遮阳网的覆盖效应主要有 、 防风防雨 、 防冰雹 、保温抗寒、避虫防病。
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【单选题】工资率上升有收入效应和替代效应，两者的作用方向相反。如果工资率一直增长到使收入效应起主要作用，则劳动供给曲线将：()
A.
向上倾斜
B.
垂直
C.
向下倾斜
D.
向后弯折
【单选题】For the (26) month, mysterious falls of large chunks of ice (冰雹) (27) rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked (28) when she was struc...
A.
Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account (44) the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been (45) through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
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【单选题】工资率上升有收入效应和替代效应，两者的作用方向相反。如果工资率一直增长到使收入效应起主要作用，则劳动供给曲线将：()
A.
向上倾斜
B.
垂直
C.
向下倾斜
D.
向后弯折
【单选题】For the (26) month, mysterious falls of large chunks of ice (冰雹) (27) rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked (28) when she was struc...
A.
Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account (44) the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been (45) through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
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