正确答案: D

unpredictable

题目：The microscope enables scientists to distinguish an incredible number and variety of bacteria.

解析：句意为：显微镜使得科学家能辨别不能预料的细菌的数量和种类。incredible“不能预料的，难以置信的”，四个选项：unavoidable“不可避免的”；unchangeable“不能改变的”；unbelievable“不能相信的”；unpredictable“不能预见的”；所以D项符合题意。

查看原题 查看所有试题

学习资料的答案和解析：

[单选题]第60题应选：

回答下面的题目:Exercise Being Good or BadCan exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. 51 trained marathon runners are not immune to fatal heart attacks. But no one knows just 52 common these sudden deaths linked to exercise are. The registration andinvestigation of such 53 is very patchy; only a national survey could determine the true 54 of sudden deaths in sports. But the climate of medical opinion is shifting in 55 of exercise, for the person recovering from a heart attack as 56 as the average lazy individual. Training can help the victim of a heart attack bylowering the 57 of oxygen the heart needs at any given level of work 58 the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, 59 .particular, be screened for signs of heart disease before 60 vigorous exercise?Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people 61 undiagnosed coronary heart disease. In North America 62 over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing isunnecessary. Not many people die from exercise, 63 , and ECGs ( 心电图 ) are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people 64 at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs 65 , they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.第51题应选：

taking up

解析：【解析】句意为：在__________进行“剧烈”的锻炼之前。taking up“开始从事，专注于”；try on“试穿，耍花招”；get over“使度过，穿过”；do with“处理，对待”。

[单选题]John is eligible for this job.

recommended 

解析：【题 干】John的工作很称职 。 【解 析】考查形容语。题干划线词eligible意为“合格的，有资格当选的”，所以正确答案为B。本题属于划线词与正确选项并非同义词或者近义词，而是基本含义相同、同时能使句子通顺的单词替换。