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完形填空。 | ||||
When school students are complaining of homework tiredness, what's a well-meaning(好心的) parent to do? Let's listen to what the experts recommend. As hard as it may be, sit back and keep cool, experts 1 . Though you've got to get them to do it, by 2 too much, or even examining 3 too carefully, you may 4 them from doing it by themselves. " I wouldn't advise a parent to check every 5 exercise," says psychologist(心理学家) John Rosemond, author of Ending the Tough Homework, "There is a 6 of understanding for trial and error(错误). Let your children 7 the grade they are worthy of." Many experts believe parents should gently look over the work of younger children and ask them to rethink about their 8 , but don't want them to feel it has to be 9 . That's not to say parents should pay no attention to 10 first, they should monitor how mush homework their kids 11 . Thirty minutes a day in the early elementary(基础) years and an hour in 12 four, five, and six is standard. For junior-high students it should be no 13 than an hour and a half, and two for high-school students. If your children 14 has more homework than this, you may check with other 15 and then talk to the teacher about reducing homework. | ||||
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该氧化物的摩尔质量为(A+16)g/mol,n g 它的氧化物的物质的量为n g (A+16)g/mol;一个氧化物分子中含有(A-N+8)个质子,所以ng 它的氧化物中所含质子的物质的量为n g (A+16)g/mol×(A-N+8)=n(A-N+8)(A+16)mo...