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题库 / GMATLA-CR-8
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?
Telomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.
In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.
The presence of telomerase in bone marrow is no indication of bone marrow cancer.
Cancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.
The level of telomerase production is always higher in cancerous tissue than in noncancerous tissue.
我第一次做B、D没分辨出来，现在觉得是这样：（全用活跃代替快速分裂）
B的错：关键不在于小孩or成人。题干说“只有活跃的才有酶”，B说“不存在酶一定是不活跃的”。“只有活跃的才有酶”不等于“活跃的都有酶”，即有些活跃的也依然没有酶，所以不存在酶的可能是不活跃的，也可能是活跃的，所以B错。
D的错：骨髓和癌都活跃，不代表骨髓+癌就会比纯癌更活跃。即使是真的，文章也推不出来。
不知道我的想法是对的错的……
我觉得你这个能说服我
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