下列各组线段（单位：cm）中，成比例线段的是（ ） A．1、2、3、4 B．1、

对化学反应速率与化学反应限度的叙述，不正确的是（　　）

A．任何可逆反应都有一定的反应限度

B．反应温度是影响化学反应速率的决定性因素

C．化学反应的限度影响了反应物在该条件下的最大转化率

D．同一化学反应若反应条件不同限度可能不同

下列省区中，跨四类干湿区的是（　　）

A．青海省

B．河南

C．湖南

D．甘肃

阅读理解。

     The time of year a baby is born can shape what profession they will embark on(从事) in later life,

a new study has suggested.

     Being born in a certain month appears to indicate the statistical likelihood of what job a person wil

l end up with, the study by the Office for National Statistics found.

     Researchers have uncovered that the month in which babies are born could also affect everything

from intelligence to length of life.

     A child born December is more likely to become a dentist while someone whose birthday falls in

January will tend to a debt collector, they found. A February birth appears to increase the chances

of being an artist while March babies appear to go on to become pilots. Meanwhile, April and May

are said to have a fairly even spread of professions, births in the summer months mean a much lower

chance of becoming a high-earning football player, doctor or dentist.

    The study was got by researchers who analyzed the birth months of people in 19 separate occupations

using information from the last survey, the Daily Mail reported. Although these trends may be difficult

to explain, correlations between birth months and specific health problems have a scientific basis.

     Spring babies are at greater risk of illnesses including schizophrenia, Alzheimer's disease, asthma

and autism.

     They may also be less clever than classmates born in other parts of the year.

1. From the passage we can know if a baby is born on February. 20, it will probably become a _____.

A. footballer      

B. doctor        

C. pianist      

D. teacher

2. According to the passage, which of the following statements is true?

A. Researchers can explain why babies will have different careers in the future

B. Researchers make the conclusion just by analyzing the birth of people in 19 separate occupations

C. Being born in a certain month will certainly determine what a baby will do in the future

D. Being born in different months has no influence on what a baby will do in the future

3. What does the underlined word "correlation" in Paragraph 5 mean?

A. close connection            

B. great influence  

C. effective solution             

D. reasonable conclusion  

4. What's the purpose of this passage?

A. To discuss a baby's birth month      

B. To describe different professions

C. to explain babies' some trends      

D. To introduce a new discovery

l2CrlMoV钢的允许最高使用温度为（）。

A.550℃

B.560℃

C.570℃

D.580℃

地面服务车辆主要包括（）、清水车、污水车、垃圾车、充氧车、残疾人登机车、摆渡车、食品车、地面引导车等。

A.客梯车

B.牵引车

C.电源车

D.气源车