下列叙述中，错误的是A．四氢叶酸(FH4)是一碳单位转移酶的辅酶 B．一碳单位参与核

碘缺乏病发病早期的形态变化为（）.

A．肿胀性甲状腺肿 

B．弥漫性甲状腺肿 

C．结节性甲状腺肿 

D．囊性甲状腺肿 

E．甲状腺灶性增生

Helen and Martin

With a thoughtful sigh, Helen turned away from the window and walked back to her favourite armchair. (51) her brother never arrive For a brief moment, she wondered if she really cared that much.

Over the years Helen had given (52) waiting for Martin to take an interest in her. Her feelings for him had gradually (53) until now, as she sat waiting for him, she experienced no more than a sister’s (54) to see what had (55) of her brother.

Almost without (56) , Martin had lost his job with a busy publishing company after spending the last eight years in New York as a key figure in the US office. Somehow the two of them hadn’t (57) to keep in touch and, left alone, Helen had slowly found her (58) in her own judgement growing. (59) the wishes of her parents, she had left university halfway (60) her course and now, to the astonishment of the whole family, she was (61) a fast-growing reputation in the pages of respected art magazines and was actually earning enough to live (62) from her paintings.

Of course, she (63) no pleasure in Martin’s sudden misfortune, but she couldn’t (64) looking forward to her brother’s arrival with (65) satisfaction at what she had achieved.

54().

A. wonder

B. idea

C. curiosity

D. regard

某传感器产生的是电压信号（几乎不能提供电流），经放大后要求输出电压与信号电压成正比，该放大电路应选用（）。

A．串联电压

B．并联电压

C．串联电流

D．并联电流负反馈

根据《关于开展建筑施工用钢管、扣件专项整治的通知》建质电[2003]35号，要充分发挥钢管、扣件质量检测机构在生产、流通、使用等环节的质量检测作用，保证检测结果的（）

A.公正性

B.可靠性

C.科学性

D.准确性

下列关于Acrobat6.0和Acrobat Reader6.0的描述错误的是？（）

A、Acrobat6.0可以新建、修改和浏览PDF文件，Acrobat Reader6.0可以浏览和打印PDF文件，但不能修改文件

B、Acrobat6.0能加密PDF文件，Acrobat Reader6.0则不能对PDF文件进行加密

C、两者都提供文本选择工具和栏选择工具，可以选中PDF文件中的文本，并可以将选中的文本复制到剪贴板上

D、Acrobat可以新建空白的PDF页面，而Acrobat Reader则不行