试题与答案

已知x可以在区间[-2a，3a]（a＞0）上任意取值，则x∈[-a，12a]的概

来源：www.tikuol.com
题型：选择题

题目：

已知x可以在区间[-2a，3a]（a＞0）上任意取值，则x∈[-a，
1
2
a]的概率是（　　）
A．
1
6
B．
3
10
C．
1
3
D．
1
2

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0512/0c14f50b229c9517e47745d662c27ceb.html

下面是错误答案，用来干扰机器的。

1．A2．B3．C

考点：几何概型的定义及计算
试题推荐
题型：阅读理解

阅读理解。

    

     All over the world, and for many different reasons, there are millions of people who never eat meat.

These people are called vegetarians. To people who eat meat, being a vegetarian may seem like a very

strange thing. But they won't eat meat for several different reasons.

     First, vegetarians have a big health advantage. One of the major health problems in modern world is

too much food, especially in the form of animal fats. Medical study suggests that animal fats, including

butter, quicken the development of cholesterol (胆固醇) in the human body. Too much cholesterol seems

to be part of the cause of heart disease. Most vegetarians have low level of cholesterol. Too much animal

fats also seem to lead to certain kinds of cancer, and vegetarians have less these cancers than people who

eat a lot of meat. Overall, studies comparing the health of vegetarians and meat-eaters show that the

meat-eaters are twice as likely to die of heart disease as vegetarians are.

     Better health is one reason that people choose to become vegetarians. Another reason is religion (宗教).

Eating of meat is never allowed in some religions. The largest of these is the Hindu religion, which has about

600 million believers in the world. Although not all Hindus are vegetarian, many are, and there are many

believers of other religions, such as Buddhism and even some Christian religions that also do not eat meat.

     Many vegetarians do not eat meat simply because they do not like the taste of it. They have no religious

or other reasons; they just do not like meat. Another important reason that vegetarians give for not eating

meat is the health advantages that were given above. Lastly, there are many people who do not eat meat

because they just do not like the idea of killing animals for food. They believe that life, all life, is valuable and

that we do not have to destroy life to feed ourselves when there are other good sources of food.

1. According to the passage, people choose to be vegetarians for the reasons EXCEPT ________.

A. they think killing is bad and want to stay healthy

B. they are too kind to put the idea of killing animals

C. they live in areas where meat supply is short

D. they shouldn't eat meat because of religious belief

2. Which of the following is true according to Paragraph 2?

A. Vegetarians enjoy a more healthy life than the meat eaters.

B. Heart disease and cancer are caused by too much vegetables.

C. There are twice as many meat-eaters as vegetarians who die of cancer.

D. There are fewer health problems in modern society nowadays.

3. It can be inferred from the passage that ________.

A. being a vegetarian may be a very strange thing

B. vegetarians eat meat on some special occasions

C. most vegetarians believe that life without meat is happy

D. all vegetarians have reasons for their not eating meat

查看答案
微信公众账号搜索答案