热点试题

[ 生物 ] 人体在正常情况下,下列生理过程能够发生的是 [     ] A.相同的RNA逆转录合成不同

人体在正常情况下,下列生理过程能够发生的是[    ]
A.相同的RNA逆转录合成不同的DNA
B.相同的DNA转录合成不同的RNA
C.相同的密码子决定不同的氨基酸
D.相同的tRNA携带不同的氨基酸

2016-05-17 | 0

[ 数学 ] 煤气公司铺设一条2800米的煤气管道,第一周铺了全长的30%,第二周铺了全长的35%,还有

煤气公司铺设一条2800米的煤气管道,第一周铺了全长的30%,第二周铺了全长的35%,还有多少米没有铺设?

2016-05-17 | 0

[ 数学 ] 若﹣xm+2y3与12xyn+2是同类项,则m+n=﹙    ﹚.

若﹣xm+2y3与12xyn+2是同类项,则m+n=﹙    ﹚.

2016-05-17 | 0

[ 数学 ] 某物体的三视图如图所示,那么该物体的形状是 [     ] A.圆柱B.球C.正方体D.长

某物体的三视图如图所示,那么该物体的形状是

[    ]
A.圆柱
B.球
C.正方体
D.长方体

2016-05-20 | 0

[ 数学 ] 根据下面三座建筑的平面位置图回答问题.(1)写出这三座建筑在图上的位置.(2)以少年宫为观

根据下面三座建筑的平面位置图回答问题.

(1)写出这三座建筑在图上的位置.
(2)以少年宫为观测点,另两个建筑各在什么方向?
(3)你还知道什么信息?

2016-05-21 | 0

[ 数学 ] 设函数.(1)求的单调区间及最大值;(2)恒成立,试求实数的取值范围.

设函数.
(1)求的单调区间及最大值;
(2)恒成立,试求实数的取值范围.

2016-05-23 | 0

[ 语文 ] 用自己喜欢的方式选出画线字的正确读音。小爪子  zhuǎ   zhǎo      尽管 j

用自己喜欢的方式选出画线字的正确读音。
子  zhuǎ   zhǎo      管 jìn    jǐn    
     gān    gǎn         困 nán   nàn

2016-05-26 | 0

[ 英语 ] The boy _______to his mother that he had ____

The boy _______to his mother that he had _______ the table for supper and then ____ down to have a rest.
A.lied ; laid ; lay B.lied ; lied ; layC.lay ; laid ; laidD.lay ; laid ; lied

2016-05-27 | 0

[ 英语 ] SPACE is a lonely place. Hundreds of thousand

SPACE is a lonely place. Hundreds of thousands of kilometers from home, astronauts have a hard life. It stands to reason that, once in a while, they need to have a good cry. But this is a lot harder than it sounds.
We still know very little about space, and about living in zero gravity. In fact, we are discovering new things every time astronauts take to the skies (and beyond). As The Atlantic reported in January, crying is not all that simple in space. This is because when a person normally cries,  gravity makes their tears move downwards. But in a spacecraft, this is not the case. Here, there is no gravity, which is why we so often see pictures of astronauts floating around. This means that, strangely, when you cry your tears have nowhere to go. As a result, they just stick to your eyes.
In May 2011, astronaut Andrew Feustel experienced this. “Tears,” as he said, “don’t fall off your eye… they just kind of stay there. ” This can be quite painful. In space, your eyes get very dry, and the added moisture is irritating (气人的). Sometimes, things get even weirder(更怪异的). The astronaut Ron Parise told The Atlantic that when tears get big enough, they “break free of the eye and float around”.
No one can be quite sure why we cry. Why should water in our eyes have anything to do with feeling sad? If you stop to think about it, crying is a very strange thing indeed. And now, thanks to the wonders of space, it just got even stranger.
小题1:The first paragraph mainly wants to tell us that       .
A.living in space is lonely
B.it’s easy to feel sad in space
C.it’s hard to cry in space
D.nobody wants to live in space
小题2:If astronauts cry in spacecraft, their tears will       .
A.move downwardsB.move upwards
C.go out of the windowD.stick to their eyes
小题3:Astronauts feel       if tears are always in their eyes.
A.sadB.comfortableC.happyD.uncomfortable
小题4:What can we learn from the passage?
A.In space our eyes are very wet.
B.Tears will float around if they are big enough in space.
C.People know everything about living in zero gravity.
D.Gravity makes people’s tears move upwards in space.

2016-05-28 | 0

[ 英语 ] Just like weather, life _________ be beautifu

Just like weather, life _________ be beautiful all the time.
A.mustn’tB.needn’tC.can’tD.wouldn’t

2016-05-28 | 0