请教一道GWD逻辑，谢谢

huxiang815

    

 

    

Telomerase is an enzyme that is produced only in cells that
are actively dividing.  For this reason
it is generally absent from body tissues in adults.  Bone marrow is an exception to this rule,
however, since even in adults, bone marrow cells continually divide to replace
old blood cells.  Cancers are another
exception, because their cells are rapidly dividing.

    

 

    

The information provided most strongly supports which of the
following?

    

 

    

1. Telomerase
        is the only enzyme that is present in cancerous cells but absent from
        cells that are not actively dividing.
2. In
        children, the only body tissues from which telomerase is absent are those
        in which cells are not rapidly dividing.
3. The
        presence of telomerase in bone marrow is no indication of bone marrow
        cancer.
4. Cancer
        of the bone marrow develops more rapidly than cancer growing in any other
        kind of adult tissue.
5. The
        level of telomerase production is always higher in cancerous tissue than
        in noncancerous tissue.

答案是C，只有从排除法得到答案，但是原文没有驳斥和支持TELOMERASE不是癌症指标啊，从题目中的论点也无法推理TELOMERASE不是，但题目是STRONGLY SUPPORTS。   请指点

lavajak

A: The presence of telomerase in bone marrow is a fact.

B: The presence of telomerase in cancer is also a fact.

There might be a high correlation between them on a certain person who has got bone marrow cancer, but there is no causality relationship between A and B.

Just my guesswork! Agree with your applicance of an exclusive method, anyway.

fightbear

这题根据生物学里的东西，所以不看题也能直接选出来是c..

分析的话T是在细胞分裂的时候才会出现的酶，成人体内只有Bone marrow 的细胞还能分裂，这里有T；儿童体内T很常见，因为在长身体；所以所有人体内Bone marrow 细胞都有T。

plus，cancer细胞一直在分裂，肯定有T。

那么一个结论就是，根据在Bone marrow 里出现T酶，没法断定这里有cancer。

huxiang815

感谢楼上两NN。
可以理解为，DIVIDING CELLS是T存在的必要充分条件。
CANCER————DIVIDING CELLS—————T
所以CANCER是T存在的必要不充分条件。