题干

组织处毛细血管内的血液中氧的含量(    )

A:与组织细胞一样

B:比组织细胞内的低

C:比组织细胞内的高

D:无法比较

上一题 下一题 0.0难度 选择题 更新时间:2019-09-05 06:44:39

答案(点此获取答案解析)

C

同类题2

阅读《我的四季》,回答问题。

我的四季

生命如四季。

春天,我在这片土地上,用我细瘦的胳膊,紧扶着我锈钝的犁。深埋在泥土里的树根.石块,磕绊着我的犁头,消耗着我成倍的体力。我汗流浃背,四肢颤抖,恨不得立刻躺倒在那片刚刚开垦的泥土之上。可我懂得我没有权利逃避,在给予我生命的同时所给予我的责任。我无须问为什么,也无须想有没有结果。我不应白白地耗费时间,去无尽地感慨生命的艰辛,也不应该自艾自怜命运怎么这样不济.偏偏给了我这样一块不毛之地。我要做的是咬紧牙关,闷着脑袋,拼却全身的力气,压到我的犁头上去。我绝不企望有谁来代替,因为在这世界上,每人都有一块必得由他自己来耕种的土地。

夏日,我曾因干旱,站在地头上,焦灼地盼过南来的风,吹来载着雨滴的云朵。那是怎样的望眼欲穿.望眼欲穿呐!盼着、盼着,有风吹过来了,但那阵风强了一点,把那片载着雨滴的云朵吹了过去,吹到另一片土地上。我恨过,恨我不能一下子跳到天上,死死地揪住那片云,求它给我一滴雨。那是什么样的痴心妄想!我终于明白,这妄想如同想要拔着自己的头发离开大地。于是,我不再妄想,我只能在我赖以生存的这块土地上,寻找泉水。秋天,我和别人一样收获。望着我那干瘪的谷粒,心里有一种又酸又苦的欢乐。但我并不因我的谷粒比别人干瘪便灰心或丧气。我把它们捧在手里,紧紧地贴近心窝,仿佛那是新诞生的一个自我。

富有而善良的邻人,感叹我收获的微少,我却疯人一样地大笑。在这笑声里,我知道我已成熟。我已有了一种特别的量具,它不量谷物只量感受。我的邻人不知和谷物同时收获的还有人生。我已经爱过.恨过,欢笑过,哭泣过,体味过,彻悟过„„细细想来,便知晴日多于阴雨,收获多于劳作。只要我认真地活过,无愧地付出过,人们将无权耻笑我是入不敷出的傻瓜,也不必用他的尽度来衡量我值得或是不值得。

到了冬日,那生命的黄昏,难道就没有什么事情好做?只有隔着窗子,看飘落的雪花.落漠的田野,或是数点那光秃的树枝上的寒鸦?不,我还可以在炉子里加上几块木柴,使屋子更加温暖;我将冷静地检点自己,我为什么失败,我做错过什么,我欠过别人什么„„但愿只是别人欠我,那最后的日子,便会心安得多!

但我还是有事情好做,我将把这一切记录下来。人们无聊的时候,不妨读来解闷;怀恨的人,也可以幸灾乐祸地骂声:活该!聪明的人也许会说这是多余;刻薄的人也许会敷衍出一把利剑,将我一条条地切割。但我相信,多数人将会理解,他们将会公正地判断我曾做过的一次。

在生命的黄昏里,哀叹和寂寞的,将不会是我!

同类题5

任务型阅读

    While it may seem like everyone surfs the web these days, there is fine line between casually checking your social media pages and having a full blown Internet addiction. If you fear that you may lose interest in other aspects of your life because you prefer to be on the Internet, you may be on your way to an Internet addiction. ____

Admit you are at risk of an addiction.

    More and more people in the world are becoming addicted to the Internet. You are not the only one with this problem; it is becoming more and more common and more and more well known. ____.

Set aside limited time for computer use.

    Make sure not to turn it on too many times a week. If you have a laptop, make sure to put it somewhere that you can remember but not somewhere that you see every day. Try keeping the lid closed when you are not using it; ____ If you have a desktop PC, try not to go near it or put something over it like a sheet.

Call people instead of sending instant messages or texts.

    If you are free on weekends, call friends and ask them to go outside. This will distract you from the computer. ____

Use an alarm clock or timer.

    Before using your computer, decide on a time limit such as 30 minutes. Set the clock or timer and make sure that you get off the computer when the time is up. Alternatively create a shutdown timer on your desktop. ____.

A. Make a small list of what you want to do within that time.

B. When the computer is not looking at you, you are less likely to use it.

C. This can be programmed to shutdown your computer after the set time

D. Luckily, there are ways to avoid living your life in front of the computer.

E. This will stop you from using the Internet so often or going on to another page.

F. If you have a problem on weekdays, phone your friends or ask for help in person.

G. Do not be embarrassed; find others with the same problem and help each other beat it.