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

游客2023-12-31  21

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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