题目:
It is required by law that the children above six years old in our country ________ to school to receive education.
A.would be sent
B.are sent
C.be sent
D.will be sent
答案:
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答案:B题目分析:原子半径越大气态氢化物的稳定性越差,非金属性越强,气态氢化物稳定性越强。A项中同主族元素从上到下,原子半径逐渐增大,氢化物的稳定性逐渐减弱,故A不符合。B项中同周期元素从左到右,原子...