照度标准值是指工作或生活场所参考平面上的（）A、高照度值 B、中照度值 C、平均照度

如图所示，在研究凸透镜成像实验中，当烛焰离凸透镜的距离小于焦距时，眼睛通过透镜观察到的虚像可能是图中的：[ ]

A.

B.

C.

D.

一氧化碳和二氧化碳只有一字之差．

（1）有人认为，两者就像孪生兄弟，这是因为______（填序号）．

A．它们由同种分子构成

B．它们由相同的元素组成

C．它们都有毒

D．它们都能溶于水

（2）也有人认为，二者化学性质相差甚远，请给出一条支持他的理由：______．

（3）其实，二者是可以相互转化的，请用化学方程式表示此过程：______．

（4）金刚石、石墨也是由同种元素组成，其性质有很大差异的原因是：______．

阅读理解

     Moving in with a boyfriend causes women to eat more unhealthily and put on weight. But the opposite

is true for men, whose longterm health benefits when they move in with a female partner.

     Dieticians at Newcastle University said both partners try to please one another, and so change their

dietary habits to suit their other half.

     It leads men to eat more light meals, such as salads, fruit and vegetables, while women choose to

make creamier, heavier dishes like curry or rich pasta sauces, which may please their partner.

     Women still have the strongest longterm influence over the couple's diet and lifestyle, as they still have

the traditional role of shopper and cook in most households.

     The report, by Newcastle University's Human Nutrition Research Centre, reviewed the finding of a

variety of research projects from the UK, North America and Australia, which looked at the eating and

lifestyle habits of couples.

     The research shows that women are more likely to put on weight and increase their consumption of

foods high in fat and sugar when they move in with their partner.

    Women also use food as a comfort when dealing with emotional stress and have been found to gain

weight when a relationship ends, while the same finding has not been observed in men.

    Many couples reported food as being central to their partnership, and eating together in the evening

was particularly important to many.

    Report author and registered dietician Dr. Amelia Lake said, "The research has shown that your

partner is a strong influence on lifestyle and people who are trying to live healthier lives should take this

factor into consideration."

1. According to the passage, moving in with a girlfriend, men ________.

A. have few changes of their dietary habits

B. have to eat more unhealthy foods

C. don't like foods high in fat and sugar at all

D. try to eat foods that their girlfriends like

2. The underlined word "light"(in Paragraph 3 ) probably means ________.

A. not very heavy      

B. less in fat and sugar

C. gentle      

D. not serious or important

3. According to the report by Newcastle University's Human Nutrition Research Centre, ________.

A. women put on weight only because they want to suit their other half

B. when men are faced with emotional stress, they will change their dietary habits

C. eating together in the evening is a good way to communicate for couples

D. it is wrong to change your dietary habits to suit your partner

4. From the passage, we can infer that ________.

A. women should pay more attention to their partner's influence on them

B. more men will play roles of shopper and cook in most households

C. couples will not change their dietary habits and lifestyle to please their partner

D. longterm health of men benefits when they move in with a female partner

5. What would be the best title for the passage?

A. Don't be silly any more, women!

B. Which are better dietary habits?

C. Boyfriends make you fat

D. Dr. Amelia Lake and his study

单位投资就业人数＝( )。

A．新增就业人数/项目总投资
B．就业人数/项目总投资
C．以前就业人数/项目总投资
D．新增就业人数/项目间接投资

在建筑物使用年限中，普通建筑和构筑物的建筑设计使用年限为( )年。

A．5

B．25

C．50

D．100