The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus; the antibodies will increase in number for the next year or so. There is now a test that reliably indicates how many antibodies are present in a person's body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.
Which one of the following conclusions is best supported by the statements above?
(A) Antibodies increase in number only until they have defeated the virus.
(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.
(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.
(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person's body.
(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.
我选 Ｃ - 排除他因作者: andrewcan 时间: 2002-9-24 02:24
we are asked for a sure conclusion from the passage.
We do not know wheather body can produce something else(other than antibody) to fight the virus,say, 2 years after the body is infected.
But, we can be sure of E, because "after a week, body produce antibody" and"there is now a test" that can tell how many antibody there.
So, by antibody test, there will be at least couple of days(within a week),no exhibition of infection is detected.
am I right?
[em14]
[此贴子已经被作者于2002-9-24 2:24:39编辑过]
作者: qiufeng1990 时间: 2002-9-24 02:43
I agree with you. It's a weird CR.
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