2. 外语
  3. In the event of fire, the alarm will sound at______of 10 seconds.

In the event of fire, the alarm will sound at______of 10 seconds.

admin2013-06-19  36
问题 In the event of fire, the alarm will sound at______of 10 seconds.
选项 A、intervals
B、rates
C、gaps
D、lengths
答案A
解析 interval指“(时间、空间的)间隔，间距”，如：Trees are planted at intervals of 3 meters．每隔3米种一棵树。 “at intervals of”是固定词组，再如：at intervals of 20 minutes=at 20-minute intervals每隔20分钟。
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