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一个池塘中所有的鱼就是一个生态系统.(判断对错)

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同类题1

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The Advantages of Hobbies

    Hobbies provide entertainment and a chance lo continuously learn something new and develop a skill set. ____

    Hobbies are praised as a key to stress reduction.Becoming lost in the mental concentration or physical action which you are deeply interested in helps you shift focus from the parts of life that are stressful. ____ And in turn you are more peaceful when working on other work.

    ____ Many people set goals with their hobbies that provide them satisfaction when these goals have been achieved.These goals can be simple,like improving a golf score,writing a certain number of pages for a novel each day or seeing an entire collection of classic films.

    Hobbies provide a sense of community when you meet other people who enjoy similar activities. ____ More populated cities typically have numerous clubs or groups for people to share their knowledge and enthusiasm about a particular hobby.Becoming a member of one of these organizations allows greater growth within your hobby,as well as a chance to make new friends.

    Having a hobby can develop a talent that makes a person feel proud and satisfied.For example,a tennis hobby developed at a young age can lead lo a career as a professional athlete one day. ____For example, writer Vladimir Nabokov also collected butterflies,which allowed him to do better in his chosen fields because he used learned skills from one to improve the other.

A.There are a variety of hobbies.

B.Hobbies provide a sense of achievement.

C.Some hobbies affect other aspects of your life.

D.Focusing on something enjoyable can calm the mind.

E.They also provide many other social and health benefits.

F.Having a hobby increases the chances to interact with like-minded people.

G.Some hobbies containing physical activities offer an enjoyable way to stay healthy.

同类题5

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未来,木星会取代太阳吗?

    ①在太阳系中,木星是行星中的“巨无霸”。它的体积和质量分别达到了地球的1320倍和318倍。不过,除此以外,木星的独特之处还在于它能发光,有自己的能源。

    ②也许你并不觉得这是什么稀罕事,那么我们先来看一下行星的定义:行星通常是指自身不发光、环绕着恒星的天体。其公转方向常与所绕恒星的自转方向相同。一般来说行星需具有一定质量,行星的质量要足够的大且近似于圆球状,自身不能像恒星那样发生核聚变反应。在人们的通常认识中,行星的确不能发光,只能依靠反射太阳的光线。但科学家研究发现,木星正在把巨大的能量不断地向周围的宇宙空间释放,它释放的能量,相当于两倍从太阳那里所获得的能量,说明木星有一半的能量来自它的内部。

    ③分别于1972年和1973年发射的“先驱者”10号与11号飞船探测的结果显示,液态氢构成了整个木星。它同太阳一样,没有坚硬的外壳,主要是通过对流形式来实现能量的释放。前苏联科学家齐巴罗夫和苏齐科夫认为,木星的核心温度已达到30000℃之高,热核反应还在其内部继续进行。

    ④那么,我们不禁要问一个严肃的问题:未来,木星会渐渐取代太阳吗?

    ⑤正如之前所说,木星是由液态氢构成的,本身并无坚硬的外壳。木星的这种构成与太阳构成方式十分相似,主要是通过对流形式来实现能量的释放。木星不仅把自己的引力能转换成热能,还在不断吸收太阳释放的能量,这就使它的能量越来越大,且热度越来越高,并使它达到了现在的高度。从木星目前的发展趋势看,它很可能成为太阳系中与太阳相差无几的第二颗恒星。

    ⑥30亿年以后,太阳到了晚年,木星很可能取代太阳的地位。虽然时间还很远,但人类不得不面对一个事实是,太阳已经是一颗垂暮的恒星了,它的光辉总有一天会熄灭,而木星的自带光源,点燃了生命顽强延续下去的希望。

(选自《探索与发现》2016年第5期,略有改动)