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?

A.Telomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.

B.In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.

C.The presence of telomerase in bone marrow is no indication of bone marrow cancer.

D.Cancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.

 B.In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.

C.The presence of telomerase in bone marrow is no indication of bone marrow cancer.

我作过，好像C是答案吧，你是那个不理解，我当时觉得B有点像，但是B不对，因为 not rapidly dividing, 也是 dividing, 我觉得也应该有，所以就是C了。你是那个不理解，什么信息也没有，我们不明白。

我觉得是c

a 不对 因为cancerous cells  中不一定只有telomerase

b 不对 因为一种tissue里没有t,但tissue里的cell还是可以divide的

d不对 因为没有提及比较

e不对 因为他说t的level在非癌组织中比癌组织中高 原文没比较

c对 他意思是在骨髓中出现t不代表患癌症 原文说t可以在癌里出现 也可以在骨髓出现 若是在骨髓里出现 并不一定代表得癌

 谢谢, 我做的时候我是没有办法推出来C的逻辑关系. 我没理解好可以在骨髓出现 .

现在明白啦...