题干

下列有关生物体内的化合物及其功能的叙述,不正确的是(    )

A:编制麻袋用的麻,其主要成分是纤维素,它属于糖类

B:鸽子体内储存能量和减少热量散失的物质是脂肪,它属于脂质

C:催化生物体内各种化学反应的酶都属于蛋白质

D:植物体缺镁会影响光合作用

上一题 下一题 0.0难度 选择题 更新时间:2019-01-16 09:49:47

答案(点此获取答案解析)

C

同类题5

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。

    Many people think of guys as being carefree when it comes to their appearance . But in fact , a lot of guys spend plenty of time in front of the mirror . They care just as much as girls do about their body image.

    Body image is a person's opinions and feelings about his or her own body and physical appearance. ____ You appreciate your body for its capabilities and accept its imperfections.

____ Here are some ideas:

    Recognize your strengths. Different body types are good for different things. What does your body do well? Maybe your speed, strength, or coordination makes you better than others at a certain sport. That may be basketball, table tennis, mountain biking , dancing , or even running . Or perhaps you have non-sports skills, like drawing, painting , singing , playing a musical instrument , writing , or acting . ____

    Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques(体形)don't just happen . ____ A healthy habit can be as simple as exercising 20 minutes to 1 hour three days a week . Working out can also lift your spirits .

    Respect your body ! Practicing good habits – regular showering ; taking care of your teeth , hair , and skin ; wearing clean clothes , and so on – can help you build a positive body image .

    ____ Your body is just one part of who you are . Your talent for comedy , a quick wit(智慧), and all the other things make you unique . So try not to let small imperfections take over.

A. Be yourself .

B. Just explore talents that you feel good about .

C. So , what can you do to develop a positive body image ?

D. They take hard work , regular workouts , and a healthy diet .

E. Use this as an opportunity to discover what you're good at .

F. The good news is that self-image and body image can be changed .

G. Having a positive body image means feeling satisfied with the way you look.