单项选择题

A．They are talking about some returned items.
B．One is making a complaint to the other.
C．They are having a chat.
D．The man is speaking in a low voice.
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单项选择题
Which of the following best expresses the main idea
A．A growing number of Americans are doubtful about what high technology can do in solving the world's problems.
B．Many scientists are beginning to believe that the better understanding of human beings will play a more decisive role in solving the world's problems.
C．More and more young scientists are trying their best to find new ways to solve the world's problems.
D．Technological creativity will still play a very important part in solving the world's problems.
单项选择题
The author states all the following EXCEPT that ______.
A．the development of present technologies can not provide any answers to today's problems
B．an increasing number of young scientists are taking a great interest in biological and social sciences
C．many people as well as scientists have come to understand the limits of natural resources
D．many scientists argue that high technology is something but not everything
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