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　　1、单选题

　　[填句补文]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：B

　　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。

　　2、

　　单选题

　　[填句补文]Scientists have learned that the sense of pain is made up of both chemical and electrical signals. ________. Scientists also have learned that the nervous system sends two different kinds-of pain messages to the brain： one very fast， the other slow.

　　A、It tells us not to use the injured part until it heals.

　　B、These signals travel from nerve cells in the injured area， up the spinal cord(脊髓)to the brain， and back down again.

　　C、The first message is the warning signal.

　　D、The other message moves at a speed of only one meter a second.

　　正确答案：B

　　答案解析：第一句讲的是疼痛的感觉是由两种信号signals 组成的，所以紧接着就提到两种信号的传播路线。B项恰恰照应了首句意思。

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