20.A.unless B.though C.if D.whether

　　答案:C

　　解析:如果你家中有人得心脏病,你可以试着做一件事。if“如果”引导条件状语从句。

　　.语篇填空

　　When we think about the value of exercise,we tend to focus on the physical benefits.But over the past decade,social scientists 1.(discover) more benefits of regular exercise:its impact 2. the way we think.Studies indicate that putting regular exercise into your routine 3. improve concentration,memory and help lower stress.

　　There is also evidence 4.(suggest) that exercise during regular work hours may improve performance.Within the study,5.(research) had over 200 employees at a variety of companies self-report their performance on a daily basis.They found that 6. employees visited the gym,their experience at work changed.7. reported managing their time more effectively,being more productive,and getting on well with their colleagues. 

　　8.,many of us can’t take exercise regularly.The reason is that we don’t have time.But let’s be clear:9. we really mean when we say we don’t have time for an activity is that we don’t consider it a priority.Instead of viewing exercise as something we do for ourselves,it’s time we 10.(start) considering physical activity as part of the work itself. 

　　答案与解析:

　　【语篇导读】本文是一篇说明文,讲的是体育锻炼不仅能让我们强身健体,而且能让我们精力充沛,与同事和谐相处,提高工作效率。

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