题目内容

_________ 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.

A. Reform
B. One-Child Policy
C. One country, two systems
D. The Belt and Road Initiative

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Taking a bird's-eye view of China, the terrian gradually descends from west to east like ______ steps of staircases.

A. three
B. four
C. five
D. two

下列分子中，由极性共价键形成的非极性分子是：

A. O2
B. H2O
C. NH3
D. CH4

下列分子中，属于极性分子的是：

A. H2O
B. CH4
C. BF3
D. CO2

水的沸点反常的高是由于分子间存在：

A. 分子间作用力
B. 氢键
C. 核力
D. 化学键