题目

下列转录的简式中，一共有几种核苷酸( ) A．4                     B．5 C．6                     D．8   答案：C【2016江苏南通】请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。【1】Mum will not let Simon go out next time unless he home before dark．【2】—Who us a talk on how to protect the environment next Monday？—Mr. Smith is．【3】We are sure that he will win the game because he a lot for it．【4】─What’s wrong with you，Jane？─I’m a little sick and I for Dad to take me to the hospital．【5】Tim is a manager now，but he once as an engineer for five years．