单选题What is one of the main items being featured in this advertisement?A A printerB A scannerC A notebook computerD A PDA (Personal Digital Assistant)

In the perspective of psychology, ________ suggests that one is engaged in a conversation and shows great interest in what is being communicated.

A.standing up straight

B.leaning in while being seated

C.keeping smiling

D.shaking hands firmly

What is the main concern of man on the fourth level?

A. The more goods the better.

B. The more "luxury" items the better.

C. The more mental satisfaction the better.

D. The more earnings the better.

A.which

B.of

C.that

A the student

B liked

C anidea

D the linguistic lecture

The underlined word "assertiveness" in the last paragraph probably means __

A. being willing to speak one's mind

B. being able to increase one's power

C. being ready to make one's own judgment

D. being quick to express one's ideas confidently

-But then we'll have to accept a Board of Directors chosen by our stockholders. Wouldn't that limit us in many ways? -Certainly. But if you consider the massive capital investment that we'll receive, you'll understand that this could take our company ------ .

：A from being a big firm to being one of the medium-tier players ;

B from being a medium-tier firm to being one of the big players ;

C from being a medium-tier firm to being one of the small players

People are confused in their attempts to control malaria in Europe in the early 1900s, because scientists ______.

A．identified only one mosquito species instead of six species

B．thought only three mosquito species transmitted disease

C．thought there was only one mosquito species

D．did not know what species was being studied

What is the main idea of this passage?

A. It is important to be on time for class in the United States.

B. The importance of being on time differs among cultures.

C. People learn' the importance of time from the culture they are in.

D. Students being late for class should explain the reason to their teacher.