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补全短文：
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（爆发)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.
正确答案：C
答案解析：第一句话说的是：加勒比群岛形成了一个锁链，把加勒比海与大西洋的其他部分分开。答案是C，因为它的第一个词是"They"，该词指"The Caribbean Islands"；而且在语义上也有很好的衔接。
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