题目内容

【题目】Ladies and gentlemen, please fasten your seat belts. The plane __________.

A. takes off B. is taking off

C. has taken off D. took off

【答案】B

【解析】句意:女士们,先生们,请系好安全带,飞机就要起飞了。表位移或起止的动词或动词短语,用现在进行时表将来。

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【题目】Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in a bid to cut the emission of greenhouse gases blamed for global warming.

Thanks to special bacteria in their stomachs, kangaroo farts contain no methane (甲烷)and scientists want to transfer that bacteria to cattle and sheep who emit large quantities of the harmful gas.

While the usual image of greenhouse gas pollution is a billowing smokestack pushing out carbon dioxidelivestock passing wind contribute a surprisingly high percentage of total emissions in some countries.

"Fourteen percent of emissions from all sources in Australia is from enteric methane from cattle and sheep" said Athol Klievea senior research scientist with the Queensland state government.

"And if you look at another country such as New Zealand, which has got a much higher agricultural basethey're actually up around 50 percent," he said.

Researchers say the bacteria also makes the digestive process much more efficient and could potentially save millions of dollars in feed costs for farmers.

But it will take researchers at least three years to isolate the bacteriabefore they can even start to develop a way of transferring it to cattle and sheep.

Another group of scientists, meanwhile, has suggested Australians should farm fewer cattle and sheep and just eat more kangaroos.

The idea is controversial (争议)but about 20 percent of health conscious Australians are believed to eat the national symbol already.

"It's low in fatit's got high protein levels and it's very clean in the sense that basically it's the ultimate free range animal (散养动物)" said Peter Ampt of the University of New South Wales's institute of environmental studies.

1 According to the passage, global warming is now mainly caused by ______.

A. methane B. carbon dioxide

C. livestock passing wind D. not mention in this passage

2 What does the underlined phrase "the idea" (Paragraph 9)refer to?

A. Australians should give kangaroo-style stomachs to cattle and sheep.

B. The bacteria could make the digestive process much more efficient.

C. Australians should farm fewer cattle and sheep and just eat more kangaroos.

D. The bacteria could potentially save millions of dollars in feed costs for farmers.

3How will Australian scientists solve the problem of global warming?

A. Eating more kangaroos.

B. Killing more cattle and sheep.

C. Letting cattle and sheep pass less wind.

D. Transferring the special bacteria in kangaroos' stomachs to cattle and sheep.

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