热岛效应是指：大的化工企业，由于生产废热的大量排放其中心地区的气温可比周围地区的温度年平均高出0.5~1.5℃，甚至更高的现象。
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电磁污染指天然的、人为的各种电磁波的干扰及有害的电磁辐射。
A. 对
B. 错
The children ________their homework at 8 o'clock in the evening.
A. do
B. are doing
C. did
D. does
We _______Tom at the moment.
A. are meeting
B. met
C. to meet
D. is meeting
I _______ London 10 years ago.
A. moved to
B. am in
C. am going to move to
D. move to
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