Last month.the researchers undertooka new project studying the effects of smoking on old people．题目和参考答案——青夏教育精英家教网——

题目内容

4．Last month，the researchers undertooka new project studying the effects of smoking on old people．

分析上个月这些研究人员进行了一项新的项目，研究吸烟对老人的影响．

解答答案是undertook；本题考查语境中选用恰当的词的适当形式． undertake承担；承诺，undertake a project承担一个项目；由last month判断句中动词需要过去时，故答案是undertook．

点评首字母填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等，结合首字母选用恰当的词，同时注意所选词的形式变化．

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14．Children who spend more time outdoor may have a lower risk of becoming near-sighted，new research suggests．
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   In the study，the researchers selected six schools and required the children，whose average age was 7 at the start of the study，to attend one additional 60-minute class of outdoor activities during each school day for three years．The parents of these children were also encouraged to engage（使参加） their children in outdoor activities after school，especially during weekends and holidays．The other half of the children，from another six schools，continued their usual activity patterns．
   After three years，30.4 percent of the kids in the intervention（干预） group had become near-sighted，compared with 38.5 percent of the kids in the control group，the researchers found．
   The reduction in the risk of near-sightedness found in the study is important，because children who develop near-sightedness at a young age are most likely to develop worse myopia （the medical term for near-sightedness） later on，the researchers said．
It is not clear exactly why spending more time outside would benefit children's eyesight．However，some research has suggested that the higher levels of light intensity found outdoors may increase the release of the chemical dopamine from the retina（视网膜） of the eye，which is beneficial to eyesight．In turn，dopamine is known to inhibit the type of growth in the eye that is associated with myopia．
Based on the new results，the researchers recommend that children spend more time outdoors because of the potential benefits to their eyesight．However，it's important to protect kids'skin and eyes from UV light，which can be damaging．
28．What is the main idea of the passage？A
A．Parents should engage children in outdoor activities．
B．Kids who often play outside may have better eyesight．
C．Kids are unlikely to gain weight if they usually play outdoors．
D．Recently researchers have discovered a cure to near-sightedness．
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A.3                    B.6                        C.9                        D.12
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B．Parents of the children in the control group were also involved in the study．
C．When playing outside，children should protect their skin and eyes from the sun．
D．Based on the results，scientists found out why staying outside benefits eyesight．

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