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.
17（）
A. contains
B. consists of
C. is made from
D. is made up of
参考答案：A
解析：
语义复现题。contain意为“包含”(详见第14题答案)，此处应选一个动词与定语从句中的宾讲animal parts搭配，该定语从句所修饰的先行词足feed(饲料)，因此选项[A]contains正确，意指含有动物成分的饲料。选项[B]consist of意为“由…组成”，如：Coal consists mostly of carbon. 选项[C]is made from意为“由…制成”；选[D]is made up of意为“由…组成”。全句可译为：但有些科学家认为，法国强制推行的禁用含动物成分的饲料的做法还没有成效。