考博英语改错模拟练习题及答案解析（50）

　　考博英语考试中有些院校的考博题型中有改错这项，考博英语改错题型需要同学们运用语法、修辞、结构等知识识别短文内的语病并作出改正，很考验考生的语法能力，新东方在线考博频道整理了考博英语改错模拟练习题及答案解析系列文章供考生们参考练习。

　　Mars has provoked much speculation on the possibilities of __1__life on Earth than any other planet in the Solar System. __2__The presence of water is a prerequisite for the existing of life. __3__Therefore, “follow the water” has been NASA’s chief guideline for the exploration of a red planet. Although Mars experiences __4__seasons like on Earth and as polar caps which composed __5__of carbon dioxide and water ice, today it is bone-dry and frigidly cold. But evidence is rapidly accumulating that Mars is once __6__much wetter, with a more clement climate.This evidence comes from orbiting satellites and from data collected by roving landers.

　　Since the 1970s, space probes of Mars have revealed __7__numerous features apparent craved by flowing water, such as winding, branched valleys resembling driedout streambeds and giant outflow channels gouged by catastrophic floods.Recent high-resolution imagery from the Mars Odyssey Themis reveal numerous examples of branched valleys that from __8__tightly-packed integrated drainage system. These channels origins at topographic high points; the valleys widen “downstream”, __9__some even displaying inner valleys. The valley networks densities,comparative to those of terrestrial drainage basins. __10__These features were most likely produced by rainfall, during wetter, warmer periods in the past.

　　答案：

　　1、much—more 或much后加more 句法错误，后半部分出现了than，前半部分用比较级

　　2、on---beyond 词汇错误，“地球以外的生命”不因该用on。

　　3、existing—existence 此行混淆，“生命的存在”应用existence。

　　4、a---the

　　5、which去掉或which后加are，句法错误。

　　6、is---was 句法错误，时态错误。虽然主句的时态是现在进行时，但是从句中有时间状语once，所以用过去时。

　　7、of-----to 词汇错误，probe与to，into搭配。

　　8、reveal---reveals 主谓不一致。

　　9、origins-----originates 词性混淆。Origin是名词意思是“起源，由来”，动词形式为originate意思是“引起，起源”

　　10、comparative---comparable词汇错误。句意为：谷地网络呈现变种度量特征，包括与陆地流域盆地相似的网状密度。应用可比较的comparable。