19.A.expectation
B.hesitation
C.concern
D.ambition
解析:句意:对考试和对毕业后的生活的担忧在青少年当中普遍引起了很多的关注。C
20.A.interviewed
B.advised
C.overlooked
D.invested此处选invested作后置定语指被访问的青少年。D
语法填空
It takes a long time for the computer to develop.At first, it worked 21.________ a calculating machine, which could simplify difficult sums.Nearly two hundred years later, the computer 22.________ (build) as an analytical machine.After it was programmed by an operator 23.________ used cards with holes, it could think 24.________ (logical) and quickly.From then on, it grew rapidly 25.________ in size and in brainpower.In the 1940s, it was as large as 26.________ room.As time went by, it was made 27.________ (small), first as a PC and then as a laptop.When 28.________ (connect) by a network, it was able to share much knowledge with others 29.________ the World Wide Web.Since the 1970s, it has been put 30.________ robots and used to make mobile phones as well as help with medical operations.Nowadays, computers are applied in many fields, such as in industry, agriculture, trade and so on.
解题导语:本文回顾了计算机的发展历程。解析:work as意为“充当担当”。答案:as解析:电脑“被做成”且发生在过去故用一般过去时的被动语态。:was built解析:定语从句的先行词是人在从句中作主语关系代词用who/that。答案:who/that解析:修饰动词think要用logical的副词形式。答案:logically解析:both与后面的and构成固定搭配答案:both解析:单数可数名词前面加不定冠词a。答案:a解析:与之前的电脑相比现在的电脑变得“更小”了。答案:smaller解析:状语从句中省略了主语和be动词因表示“被连接”所以用过去答案:connected解析:through“通过”表示方式或手段。答案:through解析:put into“装入”。答案:into
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