题干

2017年5月,我国首架国产大飞机C919试飞成功,200多家企业参与了研制和生产。这说明了(  )

A:利益共享是所有合作的基础

B:良好的竞争有利于企业发展

C:任何事业成功都需要良好合作

D:竞争要遵守道德和法律准则 

上一题 下一题 0.0难度 选择题 更新时间:2016-04-06 06:03:31

答案(点此获取答案解析)

C

同类题3

阅读《冬眠的奥秘》,完成小题

冬眠的奥秘

    ①严寒的冬天,我们总是向往着在被窝里长眠一冬——能像狗熊和青蛙那样冬眠就好了。然而我们大都不知道:那些冬眠的动物们,掌握着我们人类尚不知晓的惊天奥秘。

    ②冬眠是动物应对恶劣环境的一种策略,科学上叫“蛰伏”。有人会问,冬天里睡得多、睡得久,不就是冬眠吗?它们还真不是一回事儿,只是二者的区别不太容易看出来。拿鱼来说,有几类鱼是会冬眠的,包括我们熟悉的鲤鱼、乌鳢,还有海里的鳗鲡。每当冬天来临,它们就把自己调到冬眠档:不吃、不喝、不游动。这看似与正常档的睡觉并无二致,但请注意它们的鳃!鱼类靠鳃呼吸,平时就算身体静止不动,鳃也会轻轻开合扇动。而进入冬眠的鱼,鳃也几乎不动,完全处于麻痹状态。除了呼吸,冬眠动物的体温、心跳等生命指征也都降到极低的水平,新陈代谢速率变得非常缓慢,与休克和死亡标准只差那么一点点——这就是冬眠与睡觉的本质区别。

    ③冬眠的意义在于,尽量减少身体内外的生命活动,将能量消耗降到最低,以挨过环境严酷的时间段。动物冬眠时,能把生命的时钟调得极慢。比如生活在北美洲的普通箱龟,冬眠时心脏5-10分钟才跳1次,实在让人惊叹。更夸张的是,它们几乎完全不呼吸,只靠皮肤吸入少许氧气!

    ④科学家还发现,冬眠不是“习惯养成”的问题,而是遗传基因决定的“天赋”。这种“天赋”还与寿命的长短有联系。一般来讲,哺乳动物的寿命与体型相关,体型小的新陈代谢快,寿命短;体型大的新陈代谢慢,寿命长。比如大象就活80年,兔子七八岁就算高寿。而蝙蝠打破了这个规律——冬眠的菊头蝠和同体型的、不冬眠的老鼠相比,前者可以活到30多岁,后者却只有3、4岁。如果在同一物种中比较,如蝙蝠或者棕熊,依然是冬眠的寿命要长很多。

    ⑤冬眠是当下的热门研究领域。如果人类能像动物们一样冬眠,收获的就绝不仅仅是睡大觉的幸福感,也许还能长生不老。虽然对蝙蝠和棕熊等冬眠动物的研究能确定冬眠基因与长寿有关。但这些动物毕竟与我们人类相差太远。不过,在2004年,有个轰动科学界的发现:居然有一种猴子能冬眠!而人类跟猴子同属灵长类动物,基因相似性很高。如果猴子能冬眠,这意味着我们人类也有可能做到。到那时,我们的寿命说不定可以达到800岁!

同类题4

任务型阅读

    In the United Kingdom, vegetarianism(素食主义)is becoming very popular, with around 3 million people in the UK vegetarian____However, here is France, I often struggle to find a meat-and-fish-free choice on a menu, which can make eating in restaurants a bit of a challenge.

People are often curious why I choose to limit my diet in the way I do. There are many reasons why people may choose to be vegetarian. Many people give up meat or fish simply because they do not enjoy the taste.____They believe it has a bad effect on the environment or it is bad for health. Furthermore, many people are vegetarians to avoid wasting food. In addition, some religious beliefs forbid eating certain meats____

    ____However, although sometimes vegetarian food requires a little more creativity, it is very easy to enjoy a healthy and a balanced diet as a vegetarian especially when meat substitutes(替代品)are becoming much easier to get.

    Meat-free Mondays is a campaign to encourage every family to eat just one main meal a week which does not contain meat or fish.____This is a great challenge for anyone who would like to try out some vegetarian cooking and is a wonderful way to contribute to slowing down climate change.

A. Young kids prefer meat and fish than vegetables.

B. Some feel that killing animals for meat is wrong

C. Vegetarian food can be delicious and easy to prepare

D. The city where I grew up is known as the “vegetarian capital” of the UK

E. Overall, vegetarians usually have different reasons for choosing their lifestyle

F. The purpose of the campaign is to protect the environment and to improve health

G. A common misunderstanding about vegetarian food is that it is not tasty or healthy.