—What do you think of the concert?

—I really enjoy it. I didn't expect it _____ wonderful. [ ]

A. most

B. more

C. that

D. very

通常家庭电路中的导线用铜而不用铁，这主要是因为铜：[ ]

A.柔韧性较好

B.导热性较好

C. 导电性较好

D. 价格便宜