标签：问题:If you want to put out a fire

第一、二周 1.3 第一单元词汇测试

1、 Some home and office buildings in the U.S are now being heated with____ energy.

答案: solar

2、 On July 20th, 1969, two American____ planted the first human footsteps on the moon.

答案: astronauts

3、 For thousands of years____ have been looking at the moon, studying its appearance and its motion through the sky.

答案: astronomers

4、 The ancient Babylon calendar was

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