2. 职称英语
  3. Scientists do not know why this animal became extinct. But some theories postula

Scientists do not know why this animal became extinct. But some theories postula

游客2023-12-31  32
问题 Scientists do not know why this animal became extinct. But some theories postulate that changes in geography, climate and sea levels were held responsible.
选项 A、promise
B、predict
C、pretend
D、presume
答案 D
解析    (1)句子结构。
   本题是由两个独立的句子构成。第一个句子的结构为主动宾(SVO)，主语为Scientists，谓语动词为do not know，宾语为why引导的宾语从句。第二个句子的结构同样为主动宾(SVO)，主语为some theories，谓语动词为postulate，that引导的从句为宾语从句。
   (2)选项词义。
   A．promise vt．允诺，许诺；给人以……的指望或希望
   B．predict vt．预言，预测；预示，预告
   C．pretend vt．假装，伪装；假称；装扮
   D．presume vt．认为；假设；推测
   句子大意为“科学家们尚不清楚这种动物灭绝的原因，但一些理论认为其灭绝是因地理、气候和海平面变化所致”。postulate意思是“认为”，与选项中的presume词义最为接近，因此选项D正确。
   【知识拓展】词汇拓展：postulate与presume。
   ①postulate v．to suggest or accept that sth．is true so that it can be used as the basis for a theory, etc．
   e．g．They postulated a 500-year lifespan for a plastic container．
   他们认为塑料容器的寿命为500年。
   ②presume v. to accept that sth．is true until it is shown not to be true，especially in court
   e．g．In English law, a person is presumed innocent until proved guilty．
   英国法律规定，在证明一个人有罪之前，会先假定他是无辜的。
   The arrangement presumes that both lenders and borrowers are rational．
   这一协议假定借贷双方都是在神志清楚的状态下签订的。
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