The sea has always interested man. From it he can get food, minerals, and treasure. For thousands of years, he could sail on it. But he could not go far beneath its surface.
Man wants to explore deep into the sea. 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. He can wear a diving suit and have air pumped to him from above. He can carry a tank of air on his back and breathe through a nose and a mouthpiece. Water weighs 800 times as much as air. Tons of water pushes against a diver deep in the sea. His body is under great pressure.
When a diver is under great pressure, his blood takes in some of the gases he breathes. As he rises to surface, the water pressure becomes less. If the diver rises too quickly, the gases in his blood form bubbles. The diver is then suffering from the bends. The bends can cause a diver to double up in pain. They can even kill him.
【小題1】On the whole, this passage is about ________.
| A．special mixtures of gases in deep sea |
| B．the problems man faces in deep sea diving |
| C．a(chǎn)ir pressure under the surface of sea water |
| D．a(chǎn) kind of illness that man suffers in the sea |
| A．deep divers should be in good health |
| B．divers explore the deep sea only for treasure |
| C．diving under the water too quickly causes a kind of illness |
| D．there is a special mixture of gases under the sea |
| A．the sea began to interest man a few years ago |
| B．man is not at home deep in the sea |
| C．a(chǎn)ll divers will get the bends sooner or later |
| D．the air in the sea water will kill a diver if he is not careful |
【小題1】B
【小題2】A
【小題3】B
解析試題分析：文章介紹了人類從很早就探索海洋，從中獲取吃的，礦物質(zhì)，財(cái)富等等，但是很長(zhǎng)時(shí)間以來(lái)，他們只可以航海，但是沒辦法去海洋的下面去，潛水員要去水面以下，就必須帶氧氣瓶，并且水的壓力是很大的，如果下去以后在回來(lái)時(shí)速度太快，就會(huì)有身體上的不適等。
【小題1】 B大意理解題。文章的第二自然段人不能在水面以下呆的時(shí)間太長(zhǎng)，如果去探索深海，會(huì)面臨更大的危險(xiǎn)。第二自然段講了潛水員去水下的時(shí)候要帶氧氣瓶，水的重量是空氣重量的800倍，因此要承擔(dān)很大的壓力。第三自然段是潛水員去水深處時(shí)，他的血液會(huì)吸收他呼吸的氣體，急速反回時(shí)，會(huì)有更大的危險(xiǎn)。故答案應(yīng)為B。
【小題2】A細(xì)節(jié)理解題。文章的第三自然段講述了潛水員要承認(rèn)很大的壓力，血液會(huì)吸收他呼吸的氣體，如果返回太快，血液里的氣體會(huì)形成氣泡，就會(huì)患上減壓病，會(huì)承受痛苦，甚至有生命危險(xiǎn)，由此可知，運(yùn)動(dòng)員身體必須健康。故答案應(yīng)為Ａ．
【小題3】B細(xì)節(jié)判斷題。Ａ人類在許多年前就開始探索大海，而第一自然段人類探索大海數(shù)千年了，故Ａ是錯(cuò)誤的；all divers will get the bends sooner or later所有的潛水員都遲早會(huì)患減壓病的，這在文章當(dāng)中是無(wú)法反映出的；文章的最后一自然段最后一句話是說減壓病可能會(huì)使一個(gè)人喪生，不是海水中的空氣，是錯(cuò)誤的，故Ｂ是正解的，人類在深海是不可能安家的。
【考點(diǎn)】考查科普環(huán)保類文章的閱讀理解。
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Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in order to cut he greenhouse gases they send out, which are thought to be responsible for global warming.
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“And if you look at another country such as New Zealand, which has got a much higher agricultural base, they're actually up around 50 percent, ” he said.
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【小題1】Scientists intend to put bacteria into cattle and sheep _________.
| A．so that they can make full use of special bacteria |
| B．to help Australian farmers to earn more money |
| C．so that they can protect Australian ecosystem |
| D．to prevent them from sending out harmful gases |
| A．cattle and sheep produce more carbon dioxide |
| B．less cattle and sheep are raised in New Zealand |
| C．farm animals are responsible for greenhouse gases |
| D．New Zealand has the most animals in the world |
| A．Australians should farm fewer cattle and sheep and just eat more kangaroos. |
| B．The bacteria could make the digestive process much more efficient. |
| C．Australians should give kangaroo - style stomachs to cattle and sheep. |
| D．The bacteria could save millions of dollars in feed costs for farmers. |
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