被称为恶病质素的细胞因子是（） A.IFN B.TNF-α C.TNF-β D.IL

说出两件亨德尔在创作上的艺术成就（）、（）。

以下哪项不是眼的附属器官（）

A.眼睑

B.结膜

C.巩膜

D.泪器

E.眼外肌

人的体细胞中的染色体的数目是（　　）

A．23对

B．23条

C．13条

D．46对

It was suggested that the meeting ______ the next day.

A．be held

B．must be held

C．held

D．should hold

He has been out of work for three months; as a result, he has to ____on family expenses by one-third.

A．cut out

B．cut down

C．cut up

D．cut off