[单项选择]The natural forms of energy are the sun, the wind, the sea ______ heat from the center of the earth.


A. as well as
B. as well
C. so well as
D. so well

[单项选择]

Passage 5
The energy which the sun radiates goes in every direction, and only a minute part of it falls on the earth. Even so, it represents power of about 5,000,000 horsepower (马力)per square mile per day; the sun gives us as much energy every minute as mankind utilizes in a year. At present, we use this energy in directly, and it is our final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Water power results from the rain formed by vapor which comes from the evaporation of power. Coal represents the rain formed by vapor which comes from the evaporation of water under the sunshine. Even windmills operate because of air currents set in motion by the different heating affects of the sun in different places. Some day, through chemistry or some type of solar engine, we shall harness this great source of energy more directly. Already a scientist has worked out an engine, surprisingly efficient, in with the sun&rsq
A. only a very small part is available
B. the sun is too distant from the earth
C. it takes thousands of years for this energy to be stored up in coal and oil
D. our scientific knowledge is not sufficient

[单项选择]Techniques to harness the energy of the sun are being developed.
A. convert
B. store
C. utilize
D. receive

[单项选择]The energy gained-from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.


A. precede
B. proceed
C. progress
D. practice

[单项选择]______ forms a natural boundary between Mexico and the United States.
A. The Ohio River
B. The Mississippi River
C. The Rio Grande River
D. The Ruhr River

[填空题]

What forms flood plain

[简答题]renewable sources of energy

[单项选择]Modern forms of transportation and communication have done much to ______ the isolation of life in Alask
A. A． break downB. break intoC. break outD. break through

[单项选择]

Passage Two
Direct adverting includes all forms of sales appeals, mailed, delivered, or exhibited directly to the prospective buyer of an advertised product or service, without use of any indirect medium, such as newspapers or television. Direct advertising logically may be divided into three broad classifications, namely, direct-mail advertising, mail order advertising, and unmailed direct advertising.
All forms of sales appeals that are sent through the mails are considered direct-mail advertising. The chief functions of direct-mail advertising are to familiarize prospective buyers with a product, its name, its maker, and its merits and with the product’s local distributors. The direct-mail appeal is designed also to support the sales activities of retailers by encouraging the continued patronage of both old and new customers.
When no personal selling is involved, other methods are needed to persuade people to send in orders by mall. In addi
A. would be
B. prosperous
C. rich
D. old