Which of the following could be the best title for the passage？
A．Selling and Buying
B．What Is a Market？
C．Everything You Do Is for the Market
D．What the Market Can Do for You？

Why was the author driving along interstate 90 on a Monday？
A．He was test-driving his smart cat.
B．He liked to pick up his driving skill.
C．He did not want to be caught in the storm.
D．He was doing a test.

听力原文：The acids in acid rain are corrosive chemicals that leach nutrients from the soils, slow the growth of trees, poison lakes and combine with other chemicals to form. urban smog. The simplest way to curtail acid rain is to use less energy from fossil fuels.
The acids in acid rain are the only reason that forms urban smog alone.
A．正确
B．错误

What was the woman' s impression of Boston？
A．She was disappointed.
B．She said it was OK.
C．She felt it was too cold.
D．She thought it was beautiful.

Where was the woman on Christmas day？
A．New York
B．Boston
C．San Francisco
D．Washington DC

What dose the passage say about the "tilting train"？
A．It can carry more freight than other Vehicles.
B．It requires its tracks to be electrical.
C．Its speed demands cleaner air.
D．Its cost is very low.