题干

补全对话:根据对话内容,从方框中选择适当的选项补全对话,其中有两项为多余选项。

A. Don't you think it's a little silly?

B. I'm reading a book called YU Gong Moves a Mountain(愚公移山).

C. That’s better and faster than moving a mountain.

D. In my opinion, it's really interesting.

E. Do you prefer to read stories?

F. I still don't agree with you.

G. How about you?

Emma: What are you doing, Li Lin?

Li Lin:____

Emma: I have read it before. What do you think of the story?

Li Lin:____ Yu Gong found a good way to deal with his problem.

Emma: Really? ____ It seems impossible to move a mountain.

Li Lin: But the story is trying to show us that anything is possible if you work hard. Yu Gong kept trying and didn't give up.

Emma:____  I think we should try to find other ways to deal with a problem.

Li Lin: But what could YU Gong do except moving the mountains.

Emma: He could build a road. ____ 

Li Lin: We have different opinions about the story. There're many sides to a story and many ways to understand it.

Emma: Yes, that's fine.

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答案(点此获取答案解析)

B,D,A,F,C

同类题5

随着移动互联网的快速发展,基于互联网的共享单车应运而生.某市场研究人员为了了解共享单车运营公司M的经营状况,对该公司最近六个月内的市场占有率进行了统计,并绘制了相应的折线图.

(Ⅰ)由折线图可以看出,可用线性回归模型拟合月度市场占有率y与月份代码x之间的关系.求y关于x的线性回归方程,并预测M公司2017年4月份的市场占有率;

(Ⅱ)为进一步扩大市场,公司拟再采购一批单车.现有采购成本分别为1000元/辆和1200元/辆的A、B两款车型可供选择,按规定每辆单车最多使用4年,但由于多种原因(如骑行频率等)会导致车辆报废年限各不相同.考虑到公司运营的经济效益,该公司决定先对两款车型的单车各100辆进行科学模拟测试,得到两款单车使用寿命频数表如下:

报废年限

车型

1年

2年

3年

4年

总计

A

20

35

35

10

100

B

10

30

40

20

100

经测算,平均每辆单车每年可以带来收入500元.不考虑除采购成本之外的其他成本,假设每辆单车的使用寿命都是整数年,且以频率作为每辆单车使用寿命的概率.如果你是M公司的负责人,以每辆单车产生利润的期望值为决策依据,你会选择采购哪款车型?

参考数据:, i=16(xix¯)(yiy¯)=35i=16(xix¯)2 =17.5.

参考公式:

回归直线方程为 ŷ=b̂x+â 其中 b^ = i=1n(xix¯)(yiy¯)i=1n(xix¯)2a^ = y^b^t¯