题目内容

There are about 30 000 (species) of fish in the world.

A. 种类
B. 项目
C. 环境
D. 价钱

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I regret that I am unable to accept your kind (invitation).

A. 认可
B. 邀请
C. 欣赏
D. 方法

She mixed the (flour) and water to a smooth paste

A. 面粉
B. 配料
C. 辣椒
D. 食盐

(Roughly) speaking, we receive about fifty letters a week on the subject.

A. 整体地
B. 尴尬地
C. 粗略地
D. 愉悦地

The trip will ( ) business with pleasure.

A. move
B. keep
C. set
D. combine