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问题 选择题

除去SiO2中混有的少量生石灰和石灰石，有如下操作：①加水溶解  ②加水煮沸  ③过滤  ④加稀HCl ⑤加稀H2SO4，正确的操作顺序是（　　）

A．①③

B．④③

C．⑤③

D．②③

答案

答案：B

阅读理解

阅读下列短文，判断正（A）误（B）。

( )1. Jane often annoys her classmate in math classes.                       

( )2. Jane does best in P.E.                                                 

( )3. Jane is good at writing compositions.                                  

( )4. She needs to work hard at learning languages ,or she will fail in them.

( )5. According to the form, we can know Jane has got ten subjects.          

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单项选择题

电复律治疗术后，常并发脑梗死的时间为

A．6小时

B．24～48小时

C．72小时

D．96小时

E．108小时
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