题干

下列是脂质在细胞和生物体中具有的某些生物学功能,其中仅属于脂肪的是(  )

①构成细胞膜的重要成分②细胞内良好的储能物质③参与人体血液中脂质的运输④促进动物生殖器官的发育以及生殖细胞的形成⑤很好的绝热体,起到保温作用

A:①③④

B:②④

C:①②⑤

D:②⑤

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D

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    If you want to keep fit, please refer to the following:

    Move More

    Make it a daily habit to find ways to move your body.____ Climb stairs instead of taking the lift. Walk your dog; play with your kids. It doesn't have to be an hour in the gym or a 45-minute dance class. But that's great when you're up to it. At the same time, move more.

    Give up Smoking

    Ever since 1960 when it was announced that smoking was harmful to health, Americans have been reducing their use of tobacco products. Just recently, we've seen more and more teens smoking. Could it be the Hollywood influence?____Take care! Warn your children against smoking.

    ____

    While recent studies show a glass of wine or one drink a day can help protect against heart disease, more than that can cause other health problems such as liver and kidney disease and cancer.

    Reduce Stress

    Easier said than done. Stress comes in many ways.____Spend 30 minutes a day doing something you like such as walking on the beach or in a park, reading a good book, visiting a friend, listening to relaxing music, and watching a funny movie.

    Protect Yourself from Pollution

    If you can't live in a smog-free environment, at least avoid smoke-filled rooms.____Exercise indoors in air conditioning when air quality is good.

A. Avoid Overdrinking

B. There are many things you can do to move your arms and legs.

C. Think carefully before doing something.

D. Exercise outside when the smog(雾霾)rating is low.

E. It seems that the stars in every movie smoke cigarettes.

G. It's important to reduce it.