题干

Without my glasses, I couldn’t ______ whether that figure on the blackboard was a three or an eight.

A:make out

B:make u

C:make for

D:make off

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答案(点此获取答案解析)

A

同类题1

我省文昌市面临大海,纬度低,地理条件优越.经过科学家多年考察论证后,国务院批准在文昌市境内建设国家航天基地.目前该项目正在紧锣密鼓建设中.预见2013年可投入使用.届时,航天器将从海南大地上飞向太空,这对我国空间科学的发展,海南国际旅游岛建设和经济发展起到极大的促进作用.

研究太空特殊条件对生物变异的影响,是空间科学的重要组成部分,请你运用有关知识回答下列问题:

(1)卫星将作物种子带到太空,利用太空特殊条件,最终培育出高产优质新品种,这种育种方法属于____ 育种.

(2)前几年,我国科学家利用“神舟”飞船,对人的大颗粒淋巴细胞NK92进行研究,发现NK92的增殖速率约为地面对照组的12.5倍.由此可见,在太空特殊条件下,NK92的细胞分裂周期明显变____ .上述研究还发现,NK92中有部分基因的表达发生明显差异.基因表达过程可概括为:(请在横线上填写适当内容.)DNA____ 蛋白质

(3)2008年,我国成功地利用“神舟”七号完成了航天员太空行走计划.由于太空条件特殊,在挑选航天员过程中,对航天员的遗传素质高度重视.研究表明,有些人由于遗传方面的原因,对宇宙射线特别敏感,虽然有宇航服的保护,但一旦受到辐射,还可能会发生DNA分子中碱基对的替换、增添或____ ,从而引起基因内部结构的改变,进而可能发生某些相应的病变. 

同类题2

完形填空

    We all admit that modern technology has taken over our lives, for good of course. Young people celebrate the fast speed 1 can move at. But there is a group of people who cannot 2.

    It is the group of people who are caught up between traditional and 3 society, not exactly old and 4 change, but trying very hard to become modernized, ending up being 5in the middle. They are 40 to 60 years old and6the latest iPhone or Samsung phone. They buy an iPad just 7 they can afford to, and to play the same games on a larger screen.

    They are almost 8 the teenagers five years ago, 9 on their phones playing a game or using social media. They're everywhere. And I saw something today that made me extremely 10.

    On a train, a mother was 11 playing a Candy Crush-like game. Her daughter was sitting beside her. The little girl, about five years old, was talking to her mother about her day, shouting the next stop's name cheerily-obviously desperate attempts to get her mother's 12.

    The mother? All she did was nod and say the occasional “mmhm”. With her eyes on the13, she concentrated on completing the level. I watched the girl make a final 14 to get her mom to look at her, and when she had 15 she sighed and fell silent, defeated.

    It broke my heart, and got me 16 —what kind of game can make you 17 that you have the most beautiful thing in the world, a person you love with all your heart? What does it 18when you won't even look into her eyes or listen to her?

    The scene was so familiar years ago when parents 19that their children were too interested in their mobile devices. Look how the tables have turned now. I'm 20 whether to laugh or to cry. But all I can do now is hope that this storm passes.