听力原文：M: Ann, do you and your husband plan to have many children？
W: Only two. It's expensive to have a big family now.
What do we know about the woman？
A．She has already had two children.
B．She does not want to have any children.
C．She does not want to have a big family.

What is the main purpose to the talk？
A．To test the students' ability to understand chemistry
B．To explain different kinds of chemical processes
C．To list the jobs available to chemistry graduates
D．To introduce the students to the study of chemistry

What physical features are characteristic of birds that eat insects？ Click on two answers．
A．A thick, cone-shaped bill
B．A slender,tweezer-like bill
C．Strong jaw muscles
D．A long, sticky tongue

The word which in the passage refers to
A．tale
B．Scandinavia
C．manuscripts
D．Old English

Which of the following can be inferred from the passage？
A．Greater percentage of women are advancing professionally in the US than previously.
B．Professional men refuse to accompany their female colleagues on business trips.
C．Each year there are more female tourists in the United States.
D．Business women become successful by showing a willingness to travel alone.

According to the professor, why is chemistry sometimes called the central science？
A．Chemistry courses are the most difficult．
B．Chemical processes occur all around us．
C．Chemistry students have high status．
D．Chemists study how to control diseases．