相对作用强度和相对毒性强度均小的是：
A．普鲁卡因
B．利多卡因
C．丁卡因
D．布比卡因
E．罗哌卡因
参考答案：A
—The fishermen should have been warned of the bad weather.
—___, but they didn't listen to it.
A．Yes, they were
B．So were they
C．So should they
D．Yes, they should
能直接转变生成dTMP的化合物是
A．UTPB．CDPC．UMPD．IMPE．dUMP
