商品的价值量由生产该商品的社会必要劳动时间决定。这里的“商品的价值量”（） A．

(7分)为了探究“水的净化”过程，某实验小组从河中取了水样，观察到：水样浑浊有异味；有固体小颗粒。现对水样进行如下处理：

⑴将水样静置一段时间后进行             （填操作名称），除去固体小颗粒。再向滤液加入活性炭，除去水样中的颜色和异味，该过程属于        变化（填“物理”或“化学”）。

⑵为了判断⑴中得到的是硬水或软水，可加入          进行检验。

⑶饮用水需通过消毒，X是一种新型的自来水消毒剂，工业上制取X 的化学方程式为：

Cl₂ + 2 NaClO₂ ="=" 2 NaCl + 2 X，则X的化学式为           

阅读理解

     Much  as Robby tried,he lacked the sense of tone and basic rhythm (节奏)．But he dutifully reviewed his lessons.Over the months he tried and tried,and often repeated to me "My mom's going to hear me play some day."

     But he seemed hopeless,with no born ability.A real bad advertisement for my teaching!I was so happy when one day he stopped coming.

     Several weeks later my students were to have a recital (演奏会)．To my surprise,Robby came,asking to play in the recital.

     "But,it is for current pupils,you dropped."

     "My mom was sick.But I have been practicing.I've just got to play!"

     I didn't know what led me to agree,maybe...

     The recital came.I_put_Robby_up_last_to_play_before_my_"curtain_closer",by which,I could save the recital if...

     The recital went off well.Robby came up on stage,clothes wrinkled and his hair looked like he'd run an eggbeater through it."How could his mom...?"

     Robby pulled out the piano bench and began.It was Mozart's work!I was not prepared for what I

heard next.Like in a dream,I was then woken up by the wild applause-everybody was on their feet!

     "I've never heard you play like that,Robby!How'd you do it?"

     Through the microphone Robby explained:"Well,Miss Hondorf,remember I told you my mom was

sick?Actually she had cancer and died this morning.She was born deaf,and tonight was the first time she

ever heard me play.I wanted to make it special."

     My eyes were wet.He was not a student of mine,but a teacher!

1. We can infer from the underlined sentence that the writer________.

A. was fully confident that Robby would perform well at the recital

B. thought that Robby would make the recital special

C. thought that Robby wouldn't play at the recital

D. had no confidence in Robby at all for the recital

2. What made the boy succeed in the recital?

A. Love for his mother.

B. Musical talent.

C. The writer's help.

D. Regular practice.

3. What made the writer think that Robby was her teacher,not student?

A. That he played better than her in the recital.

B. That he loved his mother more than she did.

C. That he never gave up.

D. That,the audience gave him more applause than her.

4. What is the highlight of the recital?

A. The writer's performance.  

B. Robby's performance.

C. Robby and his mom's story.  

D. The audience's applause.

肺动脉血栓栓塞的栓子多来自______、特别是______、______和______。

集合资产管理计划申购新股时设有申购上限，所申报金额不得超过该计划的总资产。( )

按公司股票是否上市流通为标准，可将公司分为( )。

A．有限责任公司

B．股份有限公司

C．上市公司

D．非上市公司