2. 外语
  3. In many buildings hot water ______ through pipes to keep rooms warm.

In many buildings hot water ______ through pipes to keep rooms warm.

admin2011-04-26  36
问题 In many buildings hot water ______ through pipes to keep rooms warm.
选项 A、penetrates
B、circulates
C、chokes
D、surrounds
答案B
解析
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