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【单选题】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 pl...
A.
The Size of Venus
B.
Venus and the Earth
C.
Venus—the Earth’s "Twin"
D.
The Nearest Neighbor
【单选题】四川省松藩县川主寺镇的元宝山顶立有“中国工农红军长征纪念总碑”。长征起点和终点都不在四川，而红军长征纪念总碑却建在四川。你认为下列哪一理由不可能成为其历史依据（）
A.
红军长征在四川经过的时间长、活动的范围广
B.
四川是抗战的后方和指挥中心
C.
红军在四川境内爬雪山、过草地，进行了艰苦卓绝的斗争
D.
四川是红军长征的主体地区