問題詳情
請依下文回答第 36 題至第 40 題: What causes autism is a mystery.One 36 is that a phenomenon called the cellular-danger response (CDR) lies at the root of it.The CDR makes cells put their ordinary activities 37 and instead switch on their defence systems, in reaction tohigh levels in the bloodstream of chemicals called purines. These are important and widespread 38 : ATP, a molecule that shuttles energy around cells, is a purine; so are halfthe “genetic letters” in DNA. Cells under viral attack tend to shed them. Too many of them in the blood can thus be asignal of viral infection. In that case 39 the CDR makes perfect sense. But studies have shown that people withautism (and also those with some other brain conditions, such as schizophrenia) often seem to have chronic CDR. Thepurine signal has somehow 40 in the “on” position. Yet why this happens is obscure.
【題組】36
(A) theorem
(B) theory
(C) axiom
(D) adage
參考答案
答案：B
難度：簡單0.801223
統計：A(31),B(262),C(27),D(7),E(0)
用户評論
【“勞謙君子，有終吉”】評論
導致自閉症的原因是一個謎。一種（理論）是，稱為細胞危險反應（CDR）的現象是其根源。 CDR使得細胞將他們的日常活動（擱置）放在他們的防禦系統上，以對抗被稱為嘌呤的化學物質的血液中的高水平。這些是重要且廣泛的（物質）：ATP，一種能夠繞細胞穿梭能量的分子，是一種嘌呤;所以DNA中有一半是“遺傳字母”。病毒攻擊下的細胞傾向於將它們脫落。因此血液中太多的病毒可能是病毒感染的信號。在這種情況下（激活）CDR是非常有意義的。但研究表明，患有自閉症的人（以及那些患有其他一些大腦疾病的人，如精神分裂症）似乎常常患有慢性CDR。嘌呤信號以某種方式（卡住）處於“開”位置。然而，為什麼會發生這種情況並不明顯。