Government officials reported three new cases of mad cow, bringing the total so far this year to 99. Last year, France recorded just 31 cases of the mad cow disease. The rising numbers are in part (1) a new testing program that focuses on cows that are most (2) . That program has (3) 39 cases. But still 60 new cases were identified in the usual way, (4) were found in 1999. Many scientists (5) that this year, five years after safety precautions were (6) , the number of cases would be (7) .
The rise in cases has (8) some scientists to question whether the disease can be transmitted in ways not yet understood. Scientists are still (9) the disease, first recognized in cows in 1986.
It appears that it is not caused by a bacteria, virus or fungus, but (10) infectious particles called prion, perhaps (11) a virus or other agent. The disease kills cells in the brain, (12) it spongy and full of holes.
France has taken more steps to (13) safety than most European countries, (14) refusing to take English beef (15) the European Union. But some scientists believe that France has not been (16) in imposing the ban on feed that (17) animal pans.
Some French officials hope that the sudden interest in mad cow disease will mean that French consumers will become educated about it, thereby recognizing that French beef is actually (18) controlled. Every cow is given a passport at birth, and extensive information about its parentage and (19) it was raised must be (20) to any slaughterhouse. When a diseased animal is found, the entire herd is destroyed.
2（）
A.risking
B. in risk
C. at risk
D. at danger
参考答案：C
解析：
词语搭配题。at risk意为“处境危险”，如：The economy will fall further, putting more jobs at risk. (经济将进一步滑坡，使更多的人遭受失业的危险。)此处意思是：一种新测试系统主要测试那些处境最危险的奶牛。[A]risking意为“冒险的”，奶牛并不会去冒险；选项[B]in risk搭配不当。 选项[D]at danger搭配不当，danger多与in连用，意为“处于危险中”，例如：We are in danger of alienating ourselves from the masses if we sit in the office all day long. (如果整天坐在办公室，我们就有脱离群众的危险。)故选项[C]at risk正确。全句可译为：这一数目的增长部分是因为一种新的测试方案。这种新的测试系统主要检测那些处境最危险的奶牛。