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．

听力原文：Members of the I.M.F. approved reform. measures that aim to increase the voting power of countries with growing economies. As a first step, they agreed to increases in the voting rights for China, South Korea, Mexico and Turkey. These four countries were considered the least represented given the size of their economics.
Members of the I.M.F. approved reform. measures aiming at increasing the voting power of countries with growing economies. They first agreed to increases in the voting rights four countries, namely China, South Korea Peru and Turkey.
A．正确
B．错误

In this passage, what advice does the author have for married women？ __
A．Stay home and take care of their family.
B．Encourage their husband and kids to be happy and have fun while they are away.
C．Help their family learn to prepare food for themselves.
D．Have their whole family take cooking classes together.

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

why does the professor say this:
A．To show how major parties usually deal with the same issues
B．To suggest that both parties should give education more attention
C．To contrast the philosophy and methods of opposing parties
D．To point out which party is more concerned with education

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