从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Language is _______ systematic means of communicating ideas or feelings by ___ use of conventionalized signs, sounds, gestures, or marks having understood meanings.
A. a; an B. a; a C. a; the D. the; the
[答案] C
[解析] 本题考查冠词的用法。means是单数名词，后一个为具体运用。
22. There exists such a phenomenon that some people waste food __________ others haven't enough.
A. while B. until C. when D. before
[答案] A
[解析] 考查连词的用法。while在这里表示对比转折，有“然而”的意思。
23. The students are studying Unit 3 this week, and this time next week they _______ Unit 4.
A. are studying B. are to study C. will study D. will be studying
[答案] D
[解析] 本题时态的用法。句后”this time next week”是将来进行时的标志。
24. At a rough estimate. Nigeria is ______ Great Britain.
A. three times the size as B. the size three times as
C. three times as the size of D. three times the size of
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