题目内容
China is a country of varied topographical features with _____ in the west and _____ in the east.
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_________ and opening-up are the two fundamental state policies of China. They have not only promoted the sustained, swift and sound development of China’s national economy, but also helped restructure its economic system.
Taking a bird's-eye view of China, the terrian gradually descends from west to east like ______ steps of staircases.
下列分子中，由极性共价键形成的非极性分子是：
下列分子中，属于极性分子的是：
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