计量员在油罐上进行测量操作前，应先辨明（）。

All of us eat every day, but most of us don’t understand nutrition(营养). How much do you know about good nutrition? Are the following statements true or false?

1. People who don’t eat meat can stay healthy.

True. As long as people eat enough milk, eggs and meat alternates(替代物), they can get enough protein.

2. Fresh vegetables cooked at home are always more nutritious than canned vegetables.

False. The difference depends more on how vegetables are prepared than whether they are fresh or canned. Vegetables cooked in too much water can lose a large quantity of vitamins.

3. Food eaten between meals can be just as good for health as food eaten at regular meals.

True. Nutritional value depends on what types of food you eat, not when you eat them. Eating an egg or an orange between meals can contribute to a good diet.

4. Taking extra vitamins beyond the recommended daily allowances won’t give you more energy.

True. It’s widely believed that extra vitamins provide more energy. But taking more than the baby needs doesn’t make it function better, just as overfilling your gas tank doesn’t make your car run better.

5. Natural vitamins are better supplements(补充)for the diet than synthetic vitamins.

False. There is no difference. A vitamin has the same properties(性质)and specific chemical structure whether made in a laboratory or taken from plant or animal parts.

6. Older people need the same amount of vitamins as younger people.

True. Older people need the same quantity of vitamins as younger people although they need fewer calories. Certain illnesses raise the requirements for some vitamins, but that is true for the young as well as the old.

7. Food grown in poor soil is lower in vitamins than food grown in rich sold.

False. The vitamins in our foods are made by the plants themselves. They don’t come from the soil.

However, the minerals in a plant depend on the minerals in the soil.

If you have answered these questions correctly, you can say you know much about food and nutrition by today’s standards. But remember that nutrition is a growing science and that may be aged as new information is obtained.

小题1:The main purpose of the passage is to           .

A．list today’s standards of some food and nutrition

B．introduce what should be eaten and what not

C．explain what is helpful to your health and what is not

D．test our nutrition IQ by judging the problems listed小题2:From the surrounding words and sentences we know that the underlined phrase “contribute to” means         .

A．help to bring about

B．take the place of

C．make room for

D．turn to小题3:The underlined word “synthetic” most probably means       in Chinese.

A．不同的

B．特别的

C．合成的

D．天然的

从某腺体的细胞中提取一些细胞器，放入含有¹⁴C氨基酸的培养液中，培养液中含有这些细胞器完成功能所需要的物质和条件，连续取样测定标记的氨基酸在这些细胞器中的数量。下图正确的是[ ]

A．

B．

C．

D．

锅炉点火升压阶段时需防止炉膛爆炸，防止炉膛爆炸的措施有（）。

A．点火前，开动引风机给锅炉通风5~10min

B．没有风机的可自然通风5—15min

C．点燃气、油、煤粉炉时，应先投入点燃火炬之后再送风

D．需重新点燃火炬时，要重新通风，待充分清除可燃物之后再进行点火操作

E．燃气锅炉、燃油锅炉、煤粉锅炉等点火时必须特别注意防止炉膛爆炸

漏出液白细胞分类时，以下面的哪种细胞为主( )

A．淋巴细胞伴中性粒细胞
B．淋巴细胞及间皮细胞
C．淋巴细胞伴少量红细胞
D．中性粒细胞
E．嗜酸性粒细胞

设计下列4行4列的表格，各列的宽度为4厘米，行高为25磅，按表格内容填入相应的数据。字体设置成Arial，字号设置成五号，字体格式设置成加粗、倾斜、加下划线，并以WD10B.DOC为文件名保存在指定文件夹中。