问题 选择题

过量的锌粉与一定量的稀盐酸反应,为了减慢反应速率,但是又不影响生成的氢气总量,可以采取的措施是(  )

A.升高温度

B.加入少量CuSO4溶液

C.加入适量的水

D.加入浓盐酸

答案

A、升高反应体系温度,反应速率增大,不影响生成氢气的总量,故A错误;

B、加入少量CuSO4溶液,锌与硫酸铜反应置换出铜,形成原电池,反应速率加快,因为是过量的锌粉,所以不影响生成的氢气总量,故B错误;

C、加水,加水,氢离子的浓度减小,减缓反应速率,但又不影响生成氢气的总量,故C正确;

D、加浓盐酸,氢离子的浓度增大,加快反应速率,但氢离子的物质的量增多,会影响生成氢气的总量,故D错误.

故选C.

阅读理解

Madame de Stael says that only the people who can play with children are able to educate them. For success in training children, the first condition is to become a child oneself. It means to treat the child as really one’s equal, that is, to show him the same consideration, the same kind of confidence one shows to an adult. It means not to affect the child to be what we ourselves want him to become, but to be affected by the impression of what the child himself is; not to treat the child with cheating, or by force, but with the seriousness and true love suitable to his own character.

Not leaving the child in peace is the greatest problem of present methods of training children. Parents do not see that during the whole life, the need of peace is never greater than in the years of childhood, an inner peace under all outside liveliness.

But what does a child experience? Corrections, orders, interference(干涉), the whole livelong day. The child is always required to leave something alone, or to do something different, to find something different, or want something different from what he does, or finds, or wants. He is always guided in another direction from the true inner will that is leading him. All of this is caused by our so-called enthusiasm in directing, advising, and helping the child to become the same model produced in one assembly line(流水线). Understanding, the deepest characteristic of love, is almost always absent.

To bring up a child means carrying one’s soul in one’s hand; it means never placing ourselves in danger of meeting the cold look on the face of the child. It means the truth that the ways of injuring the child are limitless while the ways of being useful to him are few. How seldom does the educator remember that the child, even at four or five years of age, has already had a sharp feeling! The smallest mistrust and unkindness, the least act of injustice, leave wounds that last for life in the heart of the child. While, on the other hand, unexpected friendliness and kindness make quite as deep an impression on those soft senses.

小题1:The passage mainly talks about _______.

A.misleading zones and right ways in educating children

B.current problems in training children

C.what should be taught to children

D.the importance of educating children小题2:Children, according to the passage, are experiencing _______.

A.corrections, orders and peace

B.orders, interference and peace

C.interference, orders and corrections

D.peace, guide and praise小题3:If you were a parent, which of the following methods is TRUE according to the text?

A.You could treat your children not so seriously for they don’t understand many things.

B.You could train your children as you wish them to be since you are parents.

C.You should sometimes leave your children in peace as they wish in their childhood.

D.You should correct your children immediately if their behavior is not what you want.小题4:We may conclude that the author believes people should _______.

A.play with the children with enthusiasm all day long just to please them

B.try to give an order, advice and suggestions to their children at any time

C.treat their children just as the way they treat an adult in their daily life

D.regard their children as an equal to them and have understanding of the inner peace of them

单项选择题