询问一道GWD逻辑题，没看懂，多谢大家！

lijia1301981

Q31: TTGWD2-Q21:

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，请高手帮忙解释一下，实在没看懂，多谢了！

poppyxams

因为Telomerase只存在还在持续分裂的细胞中,所以成年人身体中没有Telomerase.
但有2个例外:骨髓细胞 和 癌症细胞

问下面哪个对.

C是对的,说骨髓里有Telomerase不能证明有癌症.

iamwuyan

Telomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.(文中没说这是唯一的酶)

In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.(只在快速分裂的细胞中有, 不能说明全部的快速分裂细胞都有, 所有推不出补集的关系)

The presence of telomerase in bone marrow is no indication of bone marrow cancer. (跟题干意思相符, 两种特例都有可能有T, 所以无法通过T的出现判断病中病)

Cancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.(没说癌症发展的关系, 无关)

The level of telomerase production is always higher in cancerous tissue than in noncancerous tissue.(没有比较两种特例T的水平, 无关)