题目内容

Regrettably, ______ who don"t have valid identification cards are not allowed to enter the company head office for security reasons.

A. that
B. those
C. this
D. these

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红外线是太阳光线中众多不可见光线的一种，由德国科学家霍胥尔于1800年发现。它之所以不能被人看到是因为______。

A. 超出了可见光谱范畴
B. 低于视觉刺激阈限
C. 不能刺激锥体细胞
D. 不能刺激棒体细胞

First Royal Bank sent a letter to its customers ______ the revised credit card policy.

A. concern
B. concerns
C. concerned
D. concerning

SLE患者不会出现的血液学异常是

A. 血红蛋白减少
B. 网织红细胞减少
C. 白细胞减少
D. 淋巴细胞减少

Employees are reminded that food in the office is not allowed since it ______ others.

A. disturbs
B. disturbing
C. disturb
D. disturbed