Using a computer or smartphone at night can cause us to【C1】______on the pounds, new research has revealed. The study found a link between blue light【C2】______—blue light is【C3】______by smartphones and tablets—and increased hunger. It found that exposure【C4】______the light increases hunger levels for several hours and even increases hunger levels【C5】______eating a meal. Results of the US study show that blue-enriched light exposure, compared with【C6】______light exposure, was【C7】______with an increase in hunger that began 15 minutes after light onset and was still【C8】______almost two hours after the meal. Blue light exposure has also already been shown to decreased【C9】______in the evening increasing the risk of insomnia. Study co-author Ivy Cheung, of Northwestern University, in Chicago, said: "A single three-hour expo sure to blue-enriched light in the evening【C10】______impacted hunger and glucose metabolism. " "These results are important because they suggest that【C11】______environmental light exposure for humans may represent a novel【C12】______of influencing food【C13】______patterns and metabolism." The study group【C14】______10 healthy adults with regular sleep and eating schedules who received【C15】______carbohydrate-rich meals. They completed a four-day trial【C16】______dim light conditions, 【C17】______involved exposure to less than 20 lux during 16 hours【C18】______and less than three lux during eight hours of sleep. On day three they were exposed to three hours of 260 lux, blue-enriched light starting 10.5 hours after waking up, and the effects were compared with dim light exposure on day two. Ms Cheung said more research is needed to determine the【C19】______of action【C20】______in the relationship between light exposure, hunger and metabolism.
【答案解析】解析：本题考查名词辨析。此句子的主干为The study found a link between blue light______and increased hunger(研究发现——蓝光会增加饥饿感)，根据常识应该是被蓝光照射，接触蓝光或暴露于蓝光下，同时浏览下文发现有light exposure的表达，因此四个选项中确定B．exposure“暴露”为正确答案。touch指具体意义“接触”时，强调动作；表抽象意义时，侧重“联系”. contact强调紧密接触的两个物体之间的联系，approach意为“途径，方法”，均与文意不符。
单选题
【C3】
【正确答案】
D
【答案解析】解析：本题考查动词辨析。此处blue light is______by smartphones and tablets放在破折号后面，是用来解释上半句的blue light…，那么结合上下文可知蓝光是智能手机和平板电脑发出的光线。emitt指“发出，散发(光、热、声音等)”，符合文意，因此D．emitted为正确答案。launch“发射(火箭、导弹或卫星)”，radiate“辐射，发射”，send“(用无线电波)送出”，均与文意不符。
【答案解析】解析：本题考查动词辨析。此宾语从句的主干为blue-enriched light exposure was______with an increase in hunger，根据前文可知蓝光照射可以增加饥饿感，因此蓝光照射与饥饿感之间是有关系的，那么此处需要填入表示“有关系”的动词，并与with连用，因此C．associated为正确答案。relate与to连用，affiliate with意为“附属于”，combine with意为“结合，联合”，均与文意不符。
【答案解析】解析：本题考查介词辨析。此处意为“在昏暗光线的环境下”，under the condition意为“在某种条件下”，因此C．under为正确答案。on the condition意为“以……为条件”；in condition表示“处于健康状况”，均与文意不符。for不与condition连用。