如图为两个物体A和B在同一直线上从不同位置出发，沿同一方向同时_爱下问搜题

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问题选择题

如图为两个物体A和B在同一直线上从不同位置出发，沿同一方向同时开始做匀加速运动的速度时间图象．已知在第3s末两个物体相遇，则这两个物体的出发点的位置关系为（　　）

A．B在A前6m处

B．A在B前6m处

C．B在A前3m处

D．A在B前3m处

答案

由于速度-时间图象与坐标轴围成面积代表位移，所以前三秒内：x_A=

1

2

×3×4m=6m

x_B=

1

2

×3×2m=3m

此时两物体相遇，说明B物体在A物体前方3m处，即A前进6mB前进3m时相遇，故C正确．

故选：C

完形填空

That morning, I got the train as always. I was a publishing director and was looking forward to embracing a new day of work, as usual. I would always turn to the crossword(纵横填字游戏), but that day it didn't     . I'd been doing it for 30-old years, but trying to read this one was like walking through syrup（糖浆）:    slow and hard. I thought I must be tired.
I said to my assistant. The      colleague contacted my wife, Beth, and she drove me straight to hospital. There, confirmation came that I'd had a stroke in the part of my brain that communication. I was now in a condition that means it's difficult or   to receive and produce language. It was the only time I     .
I was back at home a week later, and my goal was to get better and      work in a couple of months. The way to   my language ability was rough. I'd look at simple pictures and try to describe them as my mind      round and round in the darkness, looking for words．
As the months passed, it became      that I wasn't going to be able to go back to my old job. For 25 years, I had      myself as a publisher. I was used to a busy day of meetings. I enjoyed colleagues and the      I'd had. I didn’t feel ready to say goodbye to my old self. There were times when I felt incredibly     .
In the darkest months, I devoted myself to     . I couldn't manage novels or newspapers,   I tried reading poetry, and found the shorter lines less overwhelming(势不可挡的). My speech came back, and I learned how to read again, though much more slowly. I also learned the      to keep up. I allowed myself to slow down, and started to enjoy it．
, I get rid of my old skin. I grieved(感到悲痛) the past, its passing and its absence, and started to     it. Now, 10 years later, I look after my grandson a day a week, and my relationship with my family is deeper than ever. If you'd asked me 15 years ago to      the importance of the things in my life I might have said work, but now I'm no longer a high-achieving publisher or someone who reads 10 books a week. I'm a      man, and if I read 10 books a year, that’s pretty good.

B．make any sense

A．temporarily

C．unbelievably

C．suffers from

D．responds to

A．contribute to

C．straightforward

D．self-evident

A．keep up with

B．come to terms with

C．get around to

单项选择题

下列选项中，不属于“十一五”时期环境治理重点工程的是( )。

A．重点流域水污染治理
B．医疗废物及危险废物处置
C．核与辐射安全工程
D．大力发展旅游业