A new study finds that sitting can shorten a person’s life almost as much as smoking can, which _______ just how damaging inactivity can be.
A．estimatesB．highlightsC．dominatesD．ensures
B

試題分析：句意：新的研究表明，久坐會(huì)像吸煙一樣縮短人的壽命，這強(qiáng)調(diào)了不活動(dòng)的危害。Estimates估計(jì)；highlights強(qiáng)調(diào)；dominates支配；ensures確保，選B。
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