题目

1H、2H、3H－、H+ 、H2是（    ）            A．氢的5种同位素               B．5种氢元素 C． 氢元素的5种不同微粒        D．氢的5种核素 答案：C---Is that modern car _______, Linda? ---Nobody but Jim can afford such an expensive car. It must belong to _______.A. your, his B. yours, he C. your, him D. yours, him