问题 选择题

某学生要量取45mL液体,有以下规格的量筒,你认为应该选取的是(  )

A.10mL

B.25mL

C.50mL

D.100mL

答案

在使用量筒量度液体体积时,选择规格的依据是:一是保证测量一次,二是量程要与液体的取用量最接近;在上述四个选项中,50mL的量筒量取45mL水,既能一次量出,其规格与45mL也最接近,误差会最小.

故选C.

单项选择题
阅读理解

Psychology(心理学)tells us that many people hate to take risks. But it is good for us to take risks, especially (尤其)when the risk is to achieve a desired result. In that way, we become stronger and braver.

Our human nature should be to take risks, but some people just sit and wish they didn’t have the fear(恐惧)to move on. This is because of one or two failures in their lives. Please step out and don’t let the past hold you back from living life to the fullest. Move forward and move on!

In studying the psychology of taking risks, we find that human nature provides(提供) us with the desire (渴望)to experiment and take chances.

Risk taking is a great benefit(好处)that allowed our ancestors(祖先) to become stronger and stronger day by day. By taking risks they fought off enemies and discovered new territories(领土). This attitude has become a part of our modern culture. Riding a roller coaster is a common risk taking activity that even the average person seems to enjoy although they have the understanding that it is dangerous. This psychological and biological (生物学上的) connection (联系)creates an interesting connection between what is unsafe and what humans enjoy.

Getting in a car each day is a risk. Getting out of bed is a risk. There is such thing as perfect safety. We need to take risks so that we can complete (finish) many things. Astronauts take risks when they get inside a rocket; however, the things they achieve are great. Businessmen take a risk when they buy parts of a company. However, without doing that, they could not make more money.

We need to take risks so that we can gain something. It is impossible to move forward in life, earn money, enjoy a relationship, play a sport, or do anything else without taking a risk. It is all part of the game. It’s one of the most important parts of life.

小题1:Some people don’t want to take risks, mainly (主要)because ___________.

A.they are too lazy to move on

B.they feel pleased with the present life.

C.they have experienced some failures before

D.they show little interest in the strange world outside小题2:What does the underlined part “This attitude” in Paragraph 4 mean?

A.Taking risks

B.Fighting off enemies

C.Discovering new territories

D.Becoming stronger and stronger小题3: What can we infer from the passage?

A.Daily life is full of risks

B.The safest place has the greatest risk

C.People should take risks when they are young

D.We can always achieve our goals by taking risks小题4: What would be the title for the passage?

A.Taking risks is easier said than done

B.On risks taken by ancestors

C.Live our life to the fullest(充分地)

D.No risk, no gain.