题目内容

What statements about the triple hand shake are incorrect?

A. It needs 3 people offer their right hands.
B. It is extremely rare nowadays.
C. The signing of the Camp of David Middle East peace agreement is a common occasion of the triple hand shake.
D. UK Primine Minister Blair and Clinton always use triple hand shake to show their solidarity with each other.

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UK Prime Minister Blair andObama used to look each other smile and nod their heads for the camera to show their solidarity with each other.

A. 对
B. 错

DNA分子中的碱基组成是：

A．A+C=G+T
B．C=G
C．A=T
D．C+G=A+T

DNA二级结构特点有：

A．两条多核苷酸链反向平行围绕同一中心轴构成双螺旋
B．以A-T，G-C方式形成碱基配对
C．双链均为右手螺旋
D．链状骨架由脱氧核糖和磷酸组成

tRNA分子二级结构的特征是：

A．3′端有多聚A
B．5′端有C-C-A
C．有反密码子环
D．有氨基酸臂