阅读理解。

阅读理解。

Many Americans have been leaving their cars at home and riding to work on bicycles. They are
doing this because of gas prices, a slowing economy and concerns about the environment. Andy
Clark is the executive director of the League of American Bicyclists. His group supports bicycling
for fun, fitness and transportation.
Mister Clark says this is good news for the environment. He says riding a bicycle to work does
not burn fossil fuel or create erous pollutants. Experts say the effects are the most important on
short trips. The Department of Transportation says fifty percent of Americans drive eight kilometers
or fewer to work. Shorter car trips release more pollution into the air for each kilometer driven. This
is because the device in a car that produces the harmfulness of emissions needs to warm up before it
can work well.
Last year, the Pacific Northwest city of Portland, Oregon, had the highest percentage of bicycle
commuters(通勤者) in the United States. Portland has been doing progressive city planning for many
years to create special paths for bike riders.
Andrew Land is one of Portland's citizens who bikes to work every day. Mister Land is thirty-three
years old and has never owned a car. He has biked to work for twelve years. Before moving to
Portland six years ago, he lived in Washington D.C. But he was hit by a car twice while biking to
work there. That has not happened in Portland where there are special; roads for bicycles. Mister
Land bought a house near these special bike lanes. He rides almost five kilometers to work each day
. He also uses the sixty-four kilometer bike path around the city.
Andrew Land rides a cyclocross bike. He says it combines the best parts of a racing bike and a
mountain bike. You might say that Andrew Land is ' into bikes'. He recently attended a show of
handmade bicycle frames (结构). It was organized by thirty bicycle frame builders in Portland. And
he attended a legal rights workshop for bicyclists.
1. What is the correct explanation of ' Shorter car trips release more pollution into the air for
each kilometer driven'?
A. Shorter trip cars run too slowly
B. Shorter trip cars are usually bad ones
C. Shorter trip cars waste too much fuel
D. Shorter trip car drivers are not skilled
2. What can be inferred in the third paragraph?
A. Portland has more bikes than any other city in the USA
B. The people in Portland are very poor
C. The traffic in Portland is very good
D. Cars are not allowed to run in Portland
3. Why Andrew Land was hit by a car twice while biking to work in Washington D.C?
A. Because he was too careless
B. Because there were no special paths for bike riders
C. Because the road there was too crowded
D. Because he just did it for fun
4. What is the suitable meaning of ' into bikes' in the last paragraph?
A. He is fascinated with bikes
B. He lives in a house made from bikes
C. he likes to run into bikes
D. He is good at bikes