题干

-- It's snowing. I really want to run outside and make a snowman.

--           Why not have a snow ball fight instead? It's more exciting.

A:Let's go.

B:That's boring.

C:What a pity!

D:That's the main thing.

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B

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      A glass a day keeps obesity at bay. Wine has always been thought to cause weight gain because of its high sugar content, but new research suggests a glass a day could form part of a diet. Looking at past studies they found that, while heavy drinkers do put on weight, those who drink in moderation can actually lose weight.

    A scientist for the research team at Navarro University in Spain says, “Proper drinking may be more likely to protect against, rather than promote, weight gain.” An official organization reviewed the findings and agreed with most of the conclusions, particularly that present data do not clearly show if proper drinking increases weight.

    Boston University's Dr. Harvey Finkel found that the reasons relating alcohol (酒精) to changes in body weight are not properly understood. His team pointed out the strong protective effects (效果) of proper drinking on the risk of getting conditions like diabetes (糖尿病), which relate to increasing obesity. Some studies suggest that even very fat people may be at lower risk of diabetes if they are moderate drinkers.

    The group says alcohol provides energy that is quickly absorbed into the body and is not stored in fat, and that this process could explain the differences in its effects from those of other foods. They agree that future research should be directed towards assessing the roles of different types of alcoholic drinks, taking drinking patterns into consideration.

    For now there is little evidence that drinking small to moderate amounts of alcohol on a regular basis increases one's risk of becoming too fat. What's more, a study three years ago suggested that a chemical found in grapes and red wine, destroys fat cells.

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阅读下列短文后回答问题:

       光合作用是地球上最伟大的化学反应,人类对它由疑惑到认知、再到利用,经历了漫长的过程.

       从古希腊的亚里士多德开始,海尔蒙特、普里斯特利、英格豪斯、谢尼伯、梅耶和季米里亚捷夫等多个国家的科学家们相继通过自己的实验研究,逐渐帮助人们开始探寻光合作用这个神秘而伟大的生命活动.但对于光合作用的条件和产物,一直不得其解.

       1864年,德国科学家萨克斯做了一个实验:他先把绿叶在暗处放置24个小时;然后选取一个叶片,让其一半曝光,另一半遮光;一段时间后,将这个叶片取下放在隔水加热的酒精中脱色,再用碘蒸气进行处理.最终发现曝光的区域呈深蓝色,遮光的区域则没有颜色变化.

       1883年,美国的恩吉尔曼把一些好氧并能运动的细菌放入盛有一条丝状绿藻的溶液中并制成装片,放在没有空气且黑暗的环境中,然后用极细的光束照射丝状绿藻,发现细菌只向叶绿体被光照射到的部位集中.

       在此之后,美国的科学家鲁宾、卡门、卡尔文等人通过更精确的方法对光合作用进行了更为深入地研究,人们才逐渐揭开了它的神秘面纱.光合作用的发现不仅彰显了人类的智慧,对其进行深入的了解才能帮助人们更好地解释生活现象,应用于农业生产.