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補(bǔ)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(shuō)的是：加勒比群島形成了一個(gè)鎖鏈，把加勒比海與大西洋的其他部分分開(kāi)。答案是C，因?yàn)樗牡谝粋�(gè)詞是"They"，該詞指"The Caribbean Islands"；而且在語(yǔ)義上也有很好的銜接。
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