美国《科学》杂志每年评选一种在研究上取得突出进展的分子(Molecule of the year)，人们称“明星分子”．其中，1992年评选出由一个氮原子和一个氧原子结合而成的简单分子的化学式为________，其名称为________．

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 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.

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 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.

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 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.

（2009?湛江模拟）2008年北京奥运会主体育场的外形好似“鸟巢”（The Bird Nest），有一类物质也好似鸟巢，如化学式是B₅H₉的五硼烷（如图）．下列有关五硼烷的说法错误的是（ ）

A．五硼烷由5个硼原子和9个氢原子构成

B．五硼烷的相对分子质量是64

C．五硼烷中硼元素和氢元素的质量比为5：9

D．五硼烷属于化合物

（2009?湛江模拟）2008年北京奥运会主体育场的外形好似“鸟巢”（The Bird Nest），有一类物质也好似鸟巢，如化学式是B₅H₉的五硼烷（如图）．下列有关五硼烷的说法错误的是（ ）

A．五硼烷由5个硼原子和9个氢原子构成

B．五硼烷的相对分子质量是64

C．五硼烷中硼元素和氢元素的质量比为5：9

D．五硼烷属于化合物