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補全短文：

The Caribbean Islands form a chain that separates the Caribbean Sea from the rest of the Atlantic Ocean. ________. Many of the islands were formed by the eruption（爆發(fā)）of ancient volcanoes（火山）．Others are low-lying coral islands that gradually rose from the ocean.

A.They are famous for their warm, tropical climate and great natural beauty.

B.What would you see if you took a cruise to the Caribbean Islands?

C.They're like a long necklace that stretches between North and South America.

D.But life on the Caribbean Islands is not always paradise.

正確答案：C

答案解析：第一句話說的是：加勒比群島形成了一個鎖鏈，把加勒比海與大西洋的其他部分分開。答案是C，因為它的第一個詞是"They"，該詞指"The Caribbean Islands"；而且在語義上也有很好的銜接。

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