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　　1、單選題

　　[填句補(bǔ)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：B

　　答案解析：第一句話說的是：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。答案是C，因?yàn)樗�的第一個(gè)詞是"They"，該詞指"The Caribbean Islands";而且在語義上也有很好的銜接。

　　2、

　　單選題

　　[填句補(bǔ)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.

　　正確答案：B

　　答案解析：第一句講的是疼痛的感覺是由兩種信號(hào)signals 組成的，所以緊接著就提到兩種信號(hào)的傳播路線。B項(xiàng)恰恰照應(yīng)了首句意思。

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