今年是世界自然基金会第四次举办“地球一小时”活动。
This year's was the fourth annual Earth Hour, organized by the World Wildlife Fund .
将会有四次各一小时的随堂考，在复习课中举行。
There will be four one-hour quizzes. They will each take place during a recitation section.
将会有四次各一小时的随堂考，在复习课中举行。
There will be four one-hour quizzes. They will each take place during a recitation section.
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