凡危险货就一定能引起人身伤亡或财产毁损事故。

下列四个命题中，假命题的是（    ）.（考查特殊四边形的判定）

A．有三个角是直角的四边形是矩形；

B．对角线互相垂直平分且相等的四边形是正方形；

C．四条边都相等的四边形是菱形；

D．顺次连接等腰梯形各边中点,得到一个矩形

我是小小翻译家。

1．玲玲想念我们。[      ]

A. Lingling miss us.

B. Lingling misses we.

C. Lingling misses us.

2．许多年前这儿没有飞机和小汽车。[ ]

A. There wasn't cars and aeroplanes here many years ago.

B. There weren't cars or aeroplanes here many years before.

C. There were no cars or aeroplanes here many years ago.

3．五个月前你在什么地方？[ ]

A. Where are you five months ago?

B. Where were you five months ago?

C. Where was you five month ago?

4．找奶奶没有电话机。[ ]

A. My grandmother didn't have a radio.

B. My grandmother didn't have a television.

C. My grandmother didn't have a telephone.

5．我小妹妹不会读和写。 [ ]

A. My little sister can't read or write.

B. My little sister can read and write.

C. My little sister can't read and write.

AUG是蛋氨酸唯一的密码子，下列哪项可说明其重要性（）

A.tRNA的识别位点

B.30s核蛋白亚基的结合位点

C.肽链的释放因子

D.肽链合成的终止密码子

E.肽链合成的起始密码子

质量认证由第（）方进行。

A、三

B、四

C、一

D、二