C.the gap
D.the east
解析:选C。指代判断题。根据“This”前一句“A gap was created through Pangaea that stretched from the...”可知,由于地震和火山爆发,在泛大陆上裂开了一道从古地中海延伸到东部的缺口(gap),这个缺口就存在于现在的北美洲和非洲之间。故“This”指代前面提到的缺口(gap)。故答案选C。
4.From the text we know that ________.
A.there were three major stages in the breakup of Pangaea
B.Columbia supercontinent caused the breakup of Pangaea
C.the continental drift theory was named after Alfred Wegener
D.the seven continents appeared before the Jurassic Period
解析:选A。细节理解题。根据第五段第四句中“The first stage of the breakup began about”,倒数第六句“Then another breakup began about 150 to 140 million years ago.”以及该段倒数第三句“The final stage of the breakup was about 60 to 55 million years ago.”可知,泛大陆经历了三次大断裂。故答案选A。
B
ziyuanku.com(2015·四川宜宾二诊)Washington:NASA has announced evidence that Jupiter’s largest moon,Ganymede,has a saltwater ocean under its icy surface.The ocean seems to have more water than all the water on Earth’s surface,according to new Hubble observations.
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