2. 外语
  3. This is the ______ to an improvement of their living conditions.

This is the ______ to an improvement of their living conditions.

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问题 This is the ______ to an improvement of their living conditions.
选项 A、key
B、decision
C、essence
D、alternative
答案A
解析 本题是说这是他们生活条件改善的关键。A项“key(to)n．‘方法，关键；题解，答案’(the key to world peace；a key to the grammar exercises)”，符合题意。其他三项中，decision n．“决定；果断”； essence n．“本质，实质，要素”；alternative(to)n．“取舍，抉择；供选择的东西”，都与题意不符。
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