单选题 The research committee ______ representatives from countries that have their researchers and scientists stationed in Antarctica on a constant basis.

(A) is made of
(B) is consisted of
(C) is composed of
(D) is formed of

【正确答案】 C

【答案解析】[理由] 本句测试下列固定结构：
be composed of 由……组成的
=be made up of...
=consist of...
[例] Our class is composed of forty students.
=Our class is made up of forty students.
=Our class consists of forty students.
(我们班是由40个学生组成的。)
根据上述，(C)应为正选。
(A)be made of 由……制作而成
[例] This table is made of wood.
(这张桌子是木制的。)
(B)应改为主动语态consists of。
(D)应改为be formed by... 由……所形成
[例] The lake was formed by volcanic activity.
(这座湖泊是由火山运动所形成的。)