2. 外语
  3. Our ______ new machines are much more economical to run, compared to the old ones.

Our ______ new machines are much more economical to run, compared to the old ones.

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问题 Our ______ new machines are much more economical to run, compared to the old ones.
选项 A、effective
B、efficient
C、affective
D、affectionate
答案B
解析 题意是：比起旧机器来，我们______新机器运行起来经济多了。[B]efficient“效率高的”，符合题意。[A]effective“有效的”，[C]affective“感情的，情感的”，[D] affectionate“亲切的，挚爱的”都不符合题意。
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大学英语四级

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