阅读理解。
(I)
Recently, a solar powered plane took to the sky for the first time. It had passed an important test on the
way to travel around the world.
The plane took off from an airport in Switzerland at 45 km an hour It slowly rose above the fields and
into the sky. During the 90-minute flight, the plane did several turns. It climbed nearly l.6 km above the
countryside.
Engineers plan to test a night flight before July. Then they will use the results of the tests to build a second
plane. They plan to travel around the world in that plane in 2012. The plane flies at 70 km an hour. That is
faster than a bike and slower than a car. The pilots will keep the plane in the air for up to five days at a time.
(II)
Cities and states with more sidewalks and bike paths tend to have slimmer residents than locations where
people must rely on vehicle transportation, according to a new study.
The study shows active travel has significant health benefits, people who live in areas that are more
conductive (有益的) to walking and cycling are more likely 'to engage in these forms of active transport.
Researchers analyzed data from all 50 US states and 47 largest US cities, along with international data from
14 countries. Results showed that walking and cycling rates could explain more than half of the differences
in obesity rates among countries.
The US doesn't measure up well in the study, coming in at No. 12 out of 14 0n percent-age of trips adults
take by bike or on foot. Australia came in last.
The researchers suggest that in addition to infrastructure (基础设施) improvements, cities and states
should create restrictions on car use, such as car-free zones, reductions in motor vehicle speeds, and limit
more expensive car parking.
1. What information can we get from the first passage?
A. The first flight of the plane last 90 minutes.
B. The second plane will be bigger and fly faster.
C. The plane will fly for at most five hours at a time.
D. The plane uses no fuel and goes faster than a car.
2. The main purpose of the second passage is to _____.
A. promote a new way of car traveling
B. teach us how to keep residents slimmer
C. tell us people in "active cities" are slimmer
D. compare the living level of developed countries
3. It can be inferred from the second passage that _____.
A. Americans would take trips by car rather than by bike or on foot
B. all the US states and largest cities are involved with this survey
C. more expensive car parking can contribute to improve infrastructure
D. the number of bikes in Australia may be the greatest of the 14 countries
4. Which column of a newspaper may the two passages come from?
A. Food and Safety.
B. Science and health.
C. Culture and Communication.
D. Sports and Entertainment.
中；ΔH＞0，m+n＞p+q。A的质量分数与温度、压强关系正确的是（）。
