2. 外语
  3. They took ______ measures to prevent poisonous gases from escaping.

They took ______ measures to prevent poisonous gases from escaping.

admin2017-04-12  10
问题 They took ______ measures to prevent poisonous gases from escaping.
选项 A、efficient
B、beneficial
C、valid
D、effective
答案D
解析 effective a．有效的，效果好的，得力的；(法律、规章等)生效的。efficient a．效率高的，有能力的。beneficial(to／for)a．有利的，有益的，有好处的。valid a．有效的，有法律效力的；有根据的，有理的。
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