题目内容
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.
Thanks to special bacteria in their stomachs, kangaroo flatulence(肠胃气胀)contains no methane(甲烷)and scientists want to transfer that bacteria to cattle and sheep who produce large quantities of the harmful gas.
While the usual image of greenhouse gas pollution is a billowing smokestack (烟囱) pushing out carbon dioxide, farm animals’ passing wind contribute a surprisingly high percentage of total emissions (排放物)in some countries.
“Fourteen percent of emissions from all sources in Australia are from enteric methane from cattle and sheep,” said Athol Kleve, a 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 base, they're actually up around 50 percent, ” he said.
Researchers say the bacteria also make 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 (分离) the bacteria, before 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 (有争议的), but about 20 percent of health-conscious Australians are believed to eat the national symbol already.
“It's low in fat, it’s got high protein levels and it's very clean in the sense that basically it's the free-range (放养的) animal,” said Peter Amp of the University of New South Wales's institute of environmental studies.
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
2.Athol Kleve seems to believe that ________.
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
3.What do the underlined words “the idea” in paragraph 9 refer to?
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.
4.Which of the statements is the advantage Peter Amp lists about kangaroo?
A. it is rich in protein B. it is cheaper than beef
C. it is high in fat D. it is more delicious than sheep
Until the 1960's, almost everyone in the U. S. followed tradition and gave all the children in the same family the same last name or surname, as it is called. But during the 60's, young parents began giving their children strange names—names like Moonglow, Eternal Peace, and Sunshine. Some states passed laws controlling the names that parents could use. But after a court case in 1981, a federal judge ruled that parents are free to give any surnames they wish to their children.
So , for the last few decades , more parents are not giving their children the family 's sur- names .Some insist that while it ' s OK for a boy to have the father ' s family name, a girl should have the mother' s family name . Thus, Philip Gaylord and Pan Zimmitti could be brother and sister. Some parents think that using family surname is old —fashioned and boring. One couple gave their son the last name Sue because they like the Johnny Cash song," A Boy Named Sue." And finally, some parents think that giving their children different surnames is just a "neat thing to do". So the first son of a New York family has the last name Washington —Lincoln, after the two famous presidents. The daughter has the last name Anthony—Tubman after two women who fought for women's rights.
This change in naming customs presents two problems. First, if each person in the family has a different last name, family records will be very confusable. It will be hard to track a person's family, and record keeping will be difficult .Second, some physiologists are afraid that different surnames will threaten family unity. Since names have an important effect on one's identify (身份) , they think brothers and sisters will not feel connected if they have different last names.
So this problem of names will get worse as new and different last names increase. Get ready to meet Welcome Baby Darling , sister of Aren't We Glad , You ' re Here and It ' s About Time.
1.In America, ________to give children different surnames these days.
A.it is allowed by the law B.it breaks the law
C.it is one of the customs D.it is unusual
2.In the second paragraph of the passage a "neat thing to do" means________.
A.a good thing to do B.a terrible thing to do
C.a dirty filing to do D.a clean thing to do
3.According to some psychologists, the different last names will let brothers and sisters feel they
are________.
A.enemies B.as close as before
C.good fiends D.separated
4.From the last paragraph, we can see the author _____this change in naming customs.
A.is for B.is against C.doesn't care D.doesn't notice