设计数字证书的主要目的是______。A．解决公开密钥的发送问题 B．解决电子商务中

中国人吃饭习惯用筷子，西方人吃饭习惯用刀叉，这体现了[ ]

A．文化的差异

B．中国人比西方人聪明

C．西方人比中国人聪明

D．西方的文化讲斗争，中国的文化讲合作

People are overweight for many reasons, the most important one of which is that they eat the wrong foods, get the wrong types of calories per meal, and they also eat meals at the wrong time each day. Food is more powerful than any weight loss pill, because the food that you eat can either make you thin or fat. This is true because your body is like an engine, and it only needs certain foods at certain intervals(间隔)each day.

Low-calorie Diets Do Not Work 

The reason people cannot lose weight by starving themselves is that their metabolism(新陈代谢)will detect any major drop in calories and it will then adjust(调整)itself by burning fewer calories each day. That is the reason why you can eat 1,000 calories per day and not lose any weight, while your friends can eat 2,500 calories per day and not gain any weight.

Low-fat Diets Do Not Work

Many people in today’s society are buying mostly low- fat or non-fat food at the grocery store. Everybody knows how much fat is inside the food they buy. However, people are getting fatter than ever before by doing this. They are not losing weight by changing to this low-fat lifestyle.

Losing weight has nothing to do with these things. One of the most important things you can do to control your weight is to eat the proper foods, such as fruit and vegetables, eat them at the right time, and exercise every day. If people make this a habit, they will lose weight.

68. What is the main reason why people are overweight according to the author?

A. They eat the wrong foods at the wrong time.

B. They eat food with lots of calories.

C. They don’t take any weight loss pills.

D. They burn many calories every day.

69. The article is written in order to _______.

A. tell readers not to buy low-fat or non-fat food

B. tell readers how to lose weight

C. tell readers about an important scientific discovery

D. call on people to lose weight and stay healthy

70. To realize the aim of your weight loss plan, you should ________.

a. do exercise every day      

b. eat meals at the right time

c. eat fruits and vegetables   

d. eat low-fat or sweet food

e. eat the proper foods at each meal

A. a, b, c, d       B. a, b, d, e     C. a, c, d, e       D. a, b, c, e

对医疗机构内的甲类传染病患者的密切接触者，医疗机构应采取的措施是（）。

A.对疫点进行卫生处理

B.强制隔离治疗

C.在指定场所进行医学观察

D.在指定场所单独治疗

E.划定疫点

Ever wondered why some businesses fail and others seem to go from strength to strength（越来越兴旺发达）? One of the major reasons for success or failure in any business is the choice of location. The ABS can be of great help in choosing the most likely place to set up your business. Whether it’s simple or a complex business.

Case study one

A Sydney doctor specializing pediatrics(小儿科) was hoping to set up a practice outside the metropolitan area, probably on the northern coast of New South Wales. He was unsure of the best place in this region and came to the ABS for help. The ABS was able to put together a report containing details of the proportion of the children in particular areas, along with information on regions with the highest birth rates. This enabled the doctor to work out where future demand for his services would be.

Case study two

A suburban retailer（零售商）in Perth owned a shoe store which stocked a wide range of shoes for men, women and children. There had been an increase in the number of similar shoe stores in the suburban shopping center and the owner wanted to assess the possibility of switching to selling imported shoes and handbags for women only. In order to ensure whether there was a market for these products, the retailer needed to obtain details of income by age, sex, and occupation for all the women in the city of Perth. Using information from the 1996 Census(普查)of Population and Housing, the ABS was able to provide this type of information in a detailed report. With the information, the retailer was able to believe that there were enough professional working women in the area with middle to high incomes, which makes his business possible.

1. What information did the Sydney doctor get from the ABS about the northern coast of New South Wales?

A. The number of medical practices there.

B. The detailed information about the children.

C. Its present and future economic situations.

D. The ideal place to start a practice there.

2. The retailer wanted to switch to selling imported shoes and handbags for women because________.

A. there were more and more working women

B. he wanted to enlarge the original store

C. there were more and more shoe stores

D. imported products were popular

3. What does the ABS do for its customers?

A. Doing research work in the fields.

B. Suggesting the most potential market.

C. Providing considerable amounts of data.

D. Predicting the possible consumer goods.

4. This passage is most probably a(n) _____________.

A. handout for management           B. income report

C. advertisement                   D. plan for a project

患者，女，27岁。上前牙冠修复两周，一直感牙龈胀痛不适。查：烤瓷全冠，唇侧颈缘位于龈沟内1mm，龈缘充血。引起胀痛最可能的原因是（）

A.冠边缘过短

B.食物刺激牙龈

C.戴冠时损伤了牙龈

D.粘固剂残留在龈沟内

E.冠边缘不密合