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  3. Venus (金星) is known as the earth’s "twin" because the two planets are so like each other in size. The diameter of Venus is about

Venus (金星) is known as the earth’s "twin" because the two planets are so like each other in size. The diameter of Venus is about

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问题     Venus (金星) is known as the earth’s "twin" because the two planets are so like each other in size. The diameter of Venus is about 7, 520 miles (12,100 km. ), smaller than that of the earth. No other planet comes closer to the earth than Venus. At its nearest approach it is about 25,000,000 miles (40,2000,000 km. ) away.
    As seen from the earth, Venus is the first planet or star that can be seen in the western sky in the evening. At other times, it is the last planet or star that can be seen in the eastern sky in the morning. When Venus is near its brightest point, it can be seen in daylight. Early astronomers called the object that appeared in the evening Hesperus, and Phosphorus in the morning. Later, they realized these two objects were the same planet. They named it Venus in honor of the Roman goddess of love and beauty.  
The word "twin" in the first sentence means ______.
选项 A、a brother or sister of step mother or father
B、either of two children born together of the same mother
C、an adopted child
D、a deserted child
答案B
解析 本词汇题的关键是确认这个单词在文章中出现的地方(第1个句子)，再找到上下文的词义线索“…the two planets are so like each other in size”，两者很相似，符合“双胞胎”的特点。
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