阅读理解。
Cheating can happen in a lot of different ways. When people cheat, it's not fair to other people, like
the kids who studied for the test or who were the true winners of a game.
Many people like the action of cheating. It makes difficult things seem easy, like getting all the right
answers on the test. But it doesn't solve the problem of not knowing the material and it won't help on the
next test -unless the person cheats again.
Some people lose respect for cheaters and think less of them. The cheaters themselves may feel bad
because they know they are not really earning that good grade. And, if they get caught cheating, they will
be in trouble at school, and maybe at home, too.
Some kids cheat because they're busy or lazy and they want to get good grades without spending the
time studying. Other kids might feel like they can't pass the test without cheating. Even when there seems
to be a "good reason" for cheating, cheating isn't a good idea.
If you were sick or upset about something the night before and couldn't study, it would be better to
talk with the teacher about this. And if you don't have enough time to study for a test because of swim
practice, you need to talk with your parents about how to balance swimming and school.
A kid who thinks cheating is the only way to pass a test needs to talk with the teacher and his or her
parents so they can find some solutions(解决办法) together. Talking about these problems and working
them out will feel better than cheating.
1.The author thinks that when kids cheat in class,______.
A. it is unfair to other people
B. it does harm to their heath
C. teachers should punish them
D. teachers shouldn't stop them at once
2. Some students like cheating mainly because_______.
A. the material in the test is very difficult
B. they want to do better than the others
C. cheating can make hard things seem very easy
D. they have little time to study their lessons
3.The fourth paragraph mainly tells us______.
A. cheating isn't a good idea
B. why kids cheat in the test
C. some kids can't pass the test without cheating
D. some kids don't spend the time studying
4. In the passage those cheaters are advised to_______.
A. spend more time on school than on sports
B. find good solutions instead of cheating
C. try hard to be intelligent rather than lazy
D. ask their classmates for good methods of study
表示阿伏加德罗常数的值。下列叙述中不正确的是
与一定量的浓硫酸反应，产生
（标况）气体时，转移的电子数为
和足量的铁粉充分反应，转移的电子数为
）的混合物中含有的碳原子数在
之间
混合气体中含有的氮原子数为
ZnSO4+SO2↑+2H2O，Zn +H2SO4=ZnSO4+H2↑，产生的气体为二氧化硫和氢气的混合气，当产生的气体为1mol时，无论发生哪个反应，转移的电子数均为2NA，正确；B、 一定条件下，O2和足量的铁粉充分反应，氧元素的化合价由0价转变为—2价，1molO2参加反应转移的电子数为4NA，正确；C、乙酸和甲醇的相对分子质量均为46，4．6g乙醇含碳原子数为0.2NA，4．6g甲酸含碳原子数为0.1NA，二者混合物中含有的碳原子数在0.1NA至0.2NA之间，正确；D、 分子总数为NA的NO和NH3混合气体中含有的氮原子数为NA，错误。