[单项选择]There are many kinds of synthetic materials, （　） plastics are the most common.
A. between which
B. of which
C. in which
D. among which

[填空题]How many kinds of materials will the university send the applicant after they receive the application materials
The university will sand the applicant ______ kinds of material.

[简答题]

Service enterprises include many kinds of familiar businesses. Examples include dry cleaners, shoe repair stores, barber shops, restaurants, hospitals, and hotels. (1)In many cases service enterprises are moderately small because they do not have mechanized services and limit service to only as many individuals as they can accommodate at one time. For example, a waiter may be able to provide good service to four tables at once, but with five or more tables, customer service will suffer.
(2)In recent years the number of service enterprises in wealthier free-market economies has grown rapidly, and spending on services now accounts for a significant percentage of all spending. For example, private services accounted for about 20 percent of U.S. spending in 1994. Wealthier nations have developed postindustrial economies, where entertainment and recreation businesses have replaced most raw material business such as the mining, and some manufacturing industries. M

[单项选择]

People celebrate many kinds of anniversaries—birthdays, weddings, dates of employment, and so on. Some think that spending a lot on these is a waste of money, while others believe that they are of importance to the young and the society. Before any conclusion is reached, we need to look into this issue closely.
It is well justified to celebrate anniversaries, as every individual in the society enjoys the freedom of spending money on what they like. Parties and activities are organized to celebrate people’s birthdays as they hold specific meanings, which is a good opportunity for friends and relatives to catch up on each other’s life. Also, carrying with them a series of special meanings, weddings are often celebrated in an as impressive and luxurious way as possible. Much of the celebration is an expression of good spirit and cheer, as well as a demonstration of friendship and family bond.
However, luxurious birthday and wedding celebrations have
A. birthdays
B. vacations
C. weddings
D. dates of employment

[单项选择]Land pollution involves many kinds of wastes. For many years, all wastes were dumped (1) sanitary (卫生的) landfills. Sanitary landfills are large pits where garbage is (2) under layers of dirt. When hazardous wastes are put in these (3) , toxic (有毒的) substances can seep into the groundwater and enter the food chain. Hazardous wastes are those kinds of wastes that are (4) or dangerous to the (5) . They can be poisonous, corrosive (腐蚀性的), flammable, explosive, or radioactive (放 射性的). They can pollute the air or (6) fires or explosions. These wastes can also cause (7) problems for humans and animals. For these reasons, it is (8) to dispose (9) hazardous wastes in se- cured landfills (10) they cannot leak. A secured landfill is (11) on clay ground, and the pits are lined with plastic and nylon sheets to (12) the hazardous wastes in the pit.
One kind of haza
A. change
B. leakage
C. leaked
D. loss