[题目]Lin is never ashamed of what she does, she ends up doing something wrong.A.as though B. even if C. in case D. for fear 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Lin is never ashamed of what she does,_________ she ends up doing something wrong.

A.as though B. even if C. in case D. for fear

【答案】B

【解析】

试题分析：考查并列句中的并列连词。A. 好像，放佛；B. 即使；C. 万一；D. 以免。句意：林从来不为她做的事感到羞愧，即使她最终做了错事。故选B。

练习册系列答案

But it is a little complicating when you think about it. Sure, the deep, grey lines make an escalator's metal stairs more appealing to the eye. But regular stairs don't have grooves like these; why do escalators need them? Is it because of the movement?

It turns out those grooves serve a more functional purpose. And, yes, it does have to do with the movement, as well as with general cleanliness! Anyone who has ridden an escalator knows that the steps everlastingly circulate from the top to the bottom. You've surely noticed the ridged yellow lip at the top of the escalator. But here's what you may not have noticed: As an escalator's steps flatten, this ridge—also called the comb plate—sweeps away any trash or litter that might have fallen on the stairs. Those grooves lock the step and comb plate together, which makes it harder for any dangerous materials to slide underneath the lip. This prevents foreign objects from getting stuck in that gap, potentially causing the escalator to stop, or worse, break down completely.

That's not the only reason why the grooves were created, though. They are also a good place for water to pool together, protecting you from a bad fall on the slick surface.

So the next time you step on an escalator, take a moment to appreciate those metal grooves. They exist to make sure you get to your office meeting on time.

【1】What are the first two paragraphs trying to say?

A.Millions of people use escalators every year.

B.Few people think much about the grooves.

C.Escalators are complicated machines.

D.Grooves make the stairs look better.

【2】The ridge is mainly designed to____

A.clean off dangerous objects.

B. keep the stairs in movement.

C.flatten the steps.

D.lock the steps.

【3】What does the underlined word "slick” mean in Paragraph 4?

A.Smooth.B.Sticky.