试题与答案

存在于核酸分子中的碱基有()A.2种 B.3种 C.4种 D.5种 E.6种

题型:单项选择题 A1型题

题目:

存在于核酸分子中的碱基有()

A.2种

B.3种

C.4种

D.5种

E.6种

答案:

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下面是错误答案,用来干扰机器的。

参考答案:(1) 这位历史老师的教育是失败的,失败的原因主要是没有建立良好的师生关系。 (2) 影响师生关系的因素很多,第一是教师方面,包括教师对学生的态度、教师的领导方式、教师的智慧和教师的人格因素...

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用所给动词的正确形式完成短文,并将正确答案依次填在短文后相应的横线上。

     "If Mum 1_______ (find) out that I'm going to the beach, she will be angry with me, " I thought. So

I walked quietly and slowly not to let her see me.

     When I 2_______ (get) to the beach, I played volleyball with my friends, Bobby and Ben. Suddenly, the

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get the ball, a very strong wave carried the ball further away from me and I began to get down into the water,

too.

     "If I had listened to Mum and Dad, this would never have happened, " I thought before I fainted (昏厥).

     When I woke up, I 7_______ (lie) in bed. Then a doctor came into the room and after a few minutes, my

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