题干

下列有关生态学知识的叙述正确的是                                         (   )

A:分解者不一定都是微生物,微生物不一定都是分解者

B:恢复力稳定性越强的生态系统,其群落内部的营养结构越复杂

C:生态农业中由于物质的良性循环,确保了能量的循环利用,减少了废物积累

D:种群中各年龄个体数目比例适中,则该种群的密度在一定时间内会明显变大

上一题 下一题 0.0难度 选择题 更新时间:2019-04-09 10:33:27

答案(点此获取答案解析)

A

同类题1

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。

    We've all experienced peer pressure (同伴压力). It happens to everybody. However, people have different reactions. Confident people refuse to do things they don't want to do, but shy and anxious people often give in. It may be because they want to be liked. It may be because they worry that their friends will make fun of them, or perhaps they're just curious about trying something new. ____

    It's hard being the only one who says no and the question is: how do you do it? ____ If you think that missing maths, or smoking, or going somewhere you know your parents wouldn't like is a bad idea then the answer is simple: don't do it. It's your decision, nobody else's. You don't need to be aggressive. You don't need to shout and scream, but you must be confident and you must be firm. You need to say, “No thanks. I don't want to do that.”

    Being on your own against everybody else is very hard, so it can really help to have at least one other peer, or friend, who will say no too. ____ You want friends who will support you when you're in trouble. You don't want people who will always agree with the majority. Remember, the most popular people aren't always the most trustworthy.

____ — You can learn a lot from people your own age. They can teach you great football skills or the best way to do your maths homework. They can recommend music and advise you on fashion. And don't forget you can tell them things too, and that always feels great. So, find friends who have similar interests. And remember, friendship isn't about feeling depressed and guilty. ____

A. Choose your friends carefully.

B. Firstly, you must decide what you believe in.

C. It's about sharing experiences and having fun.

D. Of course, peer pressure isn't completely bad.

E. It may be because they were all born to be stubborn.

F. Depression and guilt will surely give you peer pressure.

G. Whatever the reason, some people end up doing things they really don't want to.