请根据下列语句，为“页岩气”下一个定义。（4分） ①页岩气是一种非常规天然气。

Let children learn to judge their work.    71   If corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people’s.    72   They learn to do without being taught to walk, run, climb, whistle, ride a bicycle, compare their own performances with those of more skilled people, and slowly make the needed changes.

But in school we never give a child a chance to find out his mistakes and correct them for himself.    73   we act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Let him work out, with the help of other children if he wants it, what this word says, what the answer is to that problem, whether this is a good way of saying or doing this or not.

If it is a matter of right answer, as it may be in mathematics or science, give him the answer book.    74   Why should we teachers waste time on such routine work?   75   Let the children learn what all educated people must some day learn, how to measure their own understanding, and how to know what they know or do not know.

A．Children learn to do all the other things in the same way.

B．Let him correct his own papers.

C．Point out his mistakes.

D．We do it all for him.E. We allow him to learn from other children.

F. A child learning to talk does not learn by being corrected all the time.

G. Our job should be to help the child when he tells us that he can’t find the way to get the right answer.

下列哪种疾病伴有左心室容量负荷增加（）

A.主动脉瓣关闭不全

B.心肌梗死

C.高血压病

D.心肌炎

E.肺动脉高压

在下列关系式中，正确的是______。

A．1KB＝1024×1024B

B．1MB＝1024×1024B

C．1KB＝1024×1024M

D．1GB＝1024×1024M

下列属于特定民事主体代理的行为是( )。

A．立遗嘱的行为

B．出版合同特别规定由撰稿人亲自进行的行为

C．有限责任公司发行债券的行为

D．非金融机构经办企业债券的代售行为

汽车故障按丧失工作能力程度分（）

A.局部故障

B.部分故障

C.完全故障