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三次数学危机都与无穷有关。()

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文化的产生和发展都有一定的独立性，不依赖于自身的积累。()

The label required on containers carrying barium oxide for international shipment must read ______．

A. Radioactive material
B. Spontaneously combustible
C. Keep away from food
D. Biomedical material

In ice of higher concentrations ______ is not one of the basic applying rules．

A. keep moving
B. try to work with the ice movement，and not against it
C. excessive speed means ice damage
D. use full astern as often as possible

导致酸雨和加剧温室效应的主要原因是()。
A大量砍伐森林
B水土严重流失
C燃煤和大量排放二氧化碳气体
D汽车排放尾气剧增