[单项选择]The mixture of elements in the air can be thought ________ a solution of gases.
A. of as
B. of
C. as
D. of to

[单项选择]The mixture of elements in the air can be thought ________ a solution of gases.


A. of as
B. of
C. as
D. of to

[单项选择]Air, which (it is) a mixture of elements oxygen and nitrogen (and compounds) water and carbon dioxide, also (contains) small quantities of (many other) substances.
A. it is
B. and compounds
C. contains
D. many other

[单项选择]Air is the mixture of gases in which （　） the gas is oxyen.
A. not every of
B. not all
C. none of
D. all of

[单项选择]Which of the following elements can be called the key element of a computer （ ）
A. printer
B. CPU
C. mouse
D. keyboard

[单项选择]Air is the mixture of gases in which ______ the gas is oxyen.
A. not every of
B. not all
C. none of
D. all of

[单项选择]That boys suffer more from air pollution can possibly be justified by the fact that ______.
A. the male have larger bones than the female
B. women can manufacture blood more efficiently than men
C. men usually breathe more deeply than women
D. women breathe as often as men

[单项选择]

Passage Four
Advertisement can be thought of "as the means of making known in order to buy or sell goods or services". Advertisement aims to increase people’s awareness and arouse interest. It tries to inform and to persuade. The media are all used to spread the message. The press offers a fairly cheap method, and magazines are used to reach special sections of the market. The cinema anti commercial radio are useful for local market. Television, although more expensive, can be very effective. Public notices are fairly cheap and more permanent in their power of attraction. Other ways of increasing consumer interest are through exhibitions and trade fairs as well as direct mail advertisement.
There can be no doubt that the growth in advertisement is one of the most striking features of the Western World in this century. Many business such as those handling frozen foods, liquor, tabacco and medicines have been built up largely by advertisement.
A. the press
B. television
C. radio
D. all of the above