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某脱硫装置检修后有质量分数为30%的MDEA水溶液90t，今欲用此旧溶液调配为45%（质量分数）的MDEA新溶液200t以备投产使用，需向旧溶液中加入90%（质量分数）的MDEA多少吨？水多少吨？

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阅读理解

阅读理解。

     Li Ming is a school boy .He is twelve .He lives in Shanghai .He studies in the No.3 Middle School .

He gets up at half past five every day .He reads English and Chinese in the morning .He has breakfast

at seven .After that ,he goes to school with his friends .They have four classes in the morning and two in

the afternoon .In the evening he does his homework at home .But he often watches TV on Saturday

evening .Li Ming likes drawing .He draws better than his sister .He likes reading English books .Now

he is reading an English book in the room .

1..Li Ming is a _______.    

A .student      

B .girl        

C .teacher      

D .doctor

2..Li Ming gets up _______every day .

A .at seven      

B .at five thirty  

C. at six          

D .very late

3.Li Ming does his homework _______ .

A .At night.    

B. at school  

C. at home      

D.i n the afternoon .

4.Li Ming likes_______.      

A. English and Chinese      

B. playing football

C. growing flowers          

D. drawing and reading

5.Li Ming has _______. classes at school every day .

A. four      

B .five        

C. three      

D. six
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选择题

古诗云：“春蚕到死丝方尽……”。下列有关“蚕丝”叙述中，正确的是[ ]

A．组成蚕丝的基本单位是核苷酸

B．蚕丝形成过程中一定有水产生

C．蚕丝服装可以用加酶洗衣粉清洗

D．蚕丝中一定含有的化学元素是C、H、O、N、P、Mg
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