渠道的设计要求较多，如：①有足够的输水能力，以满足（）的需要；②有足够的水位，以满足

有一位北方朋友，他热衷于农作物、蔬菜和果树的栽培技术的研究，他想了解我国古代北方农业生产技术，他可以查阅的书籍是[ ]

A．《缀术》

B．《水经注》

C．《齐民要术》

D．《黄帝内经》

读写任务。

     阅读下面的短文,然后按照要求写一篇150词左右的英语短文.

     Let children learn to judge their own work. A child learning to talk does not learn by being corrected

all the time; if corrected too much, he will stop talking. He notices a thousand times a day the difference

between his language and others' language. Bit by bit, he makes the right changes to make his language

like other people's. In the same way, children learn to talk, run, climb, ride a bicycle by comparing their

own behaviors with those of more skilled people, and slowly make the needed changes. But in school

teachers never give a child a chance to find out his mistakes for himself, even fewer chances for him to

correct himself. They do it all for him.

     Teachers act as if the student would never notice a mistake if they did not point out it to him.

     They act as if the student would never correct it unless he was made to. Soon he becomes

dependent on the teachers. Let the student do it himself. Let him work out, with the help of other children

if he wants it, what this word means and what the answer is to that problem.

    【写作内容】

     1.以约30个词概况短文的要点；

     2.然后以约120个词就,内容包括：

     (1)以自己的学习生活为例,简述你在日常学习生活中常犯的错误；

     (2)你是如何看待自己的错误的；

     (3)老师是如何对待你的错误的；

     (4)你对老师的做法的看法及理由。

    【写作要求】

     1.作文中可以使用实例或其它论述方法支持你的论点,也可以参照阅读材料的内容,但不得直接引用原文中的句子。

     2.标题自定。

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为了防止近交衰退，近交系数必须控制在（）以下。

A.5%

B.7.5%

C.10%

D.12.5%

超惠节能灯的使用环境温度为-5℃~50℃，不宜用通风条件差及紧靠灯泡的灯具使用，更不能在密封灯具中使用。

某股份有限公司对外币业务采用月初汇率进行折算，按季计算汇兑损益。3月20日收到一张期限为三个月的不带息的外币应收票据，票面金额为300万美元，当日的市场汇率为1美元＝8.21元人民币。6月20日如数收到300万美元，当日的市场汇率为1美元＝8.27元人民币。3月月初的汇率为1美元＝8.27元人民币；3月月底和4月月初的汇率均为1美元＝8.25元人民币；4月月底和5月月初的汇率均为1美元＝8．24元人民币；5月月底和6月月初的汇率均为1美元＝8.26元人民币。6月30日的汇率为1美元＝8.27元人民币。该外币应收票据在第二季度产生的汇兑收益为( )。

A．0

B．3万元

C．6万元

D．9万元