题目

下列分子晶体在熔化时，只破坏范德华力的是(填序号，下同)，既破坏范德华力，又破坏氢键的是。 ①H2 ②O2 ③P4(白磷) ④SO2 ⑤CO2⑥H2O2 ⑦HF ⑧H2N—CH2CH2COOH⑨C2H6 答案：【1】①②③④⑤⑨【2】⑥⑦⑧21st Century, ____weekly newspaper, provides us with____variety of fresh articles about campus studies and life. A．a, the B．the, a C．the, / D．a, a