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.
10（）
A. stems from
B. developed in
C. grew out of
D. generated from
参考答案：A
解析：
词语搭配题。stem from意为“产生于，根源是”，如：Her interest in flowers stems from her childhood in the country. (她对花的兴趣来自于在乡间度过的童年。)原句提及疯牛病不是由细菌、病毒或真菌引起的，而是一种被称为朊病毒的蛋白质感染粒子引起的，故选项[A]stems from正确。选项[B]developed in意为“在…里发展”；选项[C] grew out of意为“由…产生”，如：Her sympathy grew out of understanding. (因了解而产生同情。)选项[D] generated from意为“产生于”，均与句意不符。