4. There are 103 elements found in nature, are metals.

   A. most of which   B. most of them

   C. most of that   D. most which

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7. The English teacher laid particular the need of reading aloud.

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把下列句子合并為含有定語從句的主從復(fù)合句

7. Fll never forget the days. We studied together then.

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9. It's helpful to put children in a situation they

can see themselves differently.

   A. that   B. when

   C. which   D. where

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5. Some of them are being removed and some are being put into museums.

翻譯：

仿寫你無法搬進(jìn)那所房子，因?yàn)樗诰S修。

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9. They are visiting a tower the 15th century.

   A. that dates back from   B. which dated from

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3. She described in her composition the people and places impressed her most.

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4. Jack passed the test, (這使我們很高興) .

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根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填人空白處 的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

The sea has always interested man. From it he can get food,minerals and treasure. 1 But he could not go far beneath its surface.

2 However,he is not a fish. He must breathe air,so he can't stay under the water's surface for any length of time. To explore deep water,man faces even more dangers and problems.

A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases.

3 He can carry a tank of air on his back and breathe through a hose and a mouthpiece. Water weighs 800 times as much as air. Tons of water pushes against a diver deep in the sea. 4

When a diver is under great pressure,his blood takes in some of the gases he breathes. As he rises to the surface,the water pressure becomes less. If the diver rises too quickly,the gases in his blood form bubbles (氣泡). The diver is then suffering from the bends (潛 涵病) .The bends can cause a diver to double up in pain.5

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   F. The water pressure can cause a diver to breathe with difficulty.

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