Questions 3 and 4 are based on the following news item.
A. Orbital space around the star.
B. NASA discovered new habitable planets.
C. How Kepler spacecraft detects planets orbiting distance stars.
D. Why Earth and Mars are considered to be in the habitable zone .
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Question 4 音频同上
A. Orbital space that is close to the star.
B. Orbital space that keeps the planet's surface neither too hot nor too cold.
C. Orbital space that is far from the star.
D. Orbital space that is around the sun.
完成句子,部分空白内容可从下表中选择填入,注意要用正确的形式:
20世纪50年代,社会主义国家形成拥有世界三分之一人口和四分之一土地的社会主义阵营。()
A. 对
B. 错
考虑到当时中国的实际情况,国共两党都不可能马上推翻另外一个政权。()
A. 对
B. 错