阅读理解。
Baseball is one of the favorite sports in the USA. Children play baseball in sports field or in parks.
At summer picnics , there is often an informal baseball game. Boys and girls, young and old take turns
to bat (击球).Each team has 9 players.
The baseball season goes from April to September. During this time , baseball matches are shown on
TV and members of the important baseball teams become America's heroes. At the end of the season
the two top teams play against each other. Many baseball fans go along to watch the game. Millions of
others listen to the radio or watch TV. People soon interested to talk about the result and the players.
American football is maybe the most popular sport in the USA. The football season begins when the
baseball season ends. When there is an important game, thousands of people sit besides the radio or in
front of the TV set to hear the result.
1. Baseball is ______.
A. as popular as football in the USA
B. more popular than football in America
C. not so popular as football in America
D. loved best by the people in the United States
2. In the USA children play baseball ______.
A. in the sports field
B. in the garden
C. in the park
D. A and C
3. There are ______ in a baseball team.
A. eight players
B. nine players
C. eleven players
D. twelve players
4. The baseball season goes ______.
A. from spring to autumn
B. from summer to autumn
C. from spring to winter
D. from summer to winter
5. Which of the following sentences is wrong?
A. American football may be the favorite sport in the USA.
B. When people have picnics in summer they often have a baseball match.
C. No matter where the baseball matches are held , the fans always go along to watch them.
D. More people in America are interested in baseball than in football.
，则N2的转化率а1=_________；若容器压强恒定，达到平衡状态时，N2的转化率为а2，则а2____(填“>”“<”或 “=”)а1。
4NO+ 6H2O；