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问题 选择题

下列变化中需加入氧化剂才能实现的是[ ]

①H2S→SO2;②2H+→H2;③NO2→N2O4;④Cl2→HClO; ⑤H2O2→O2;

⑥AsO42-→AsO33-;⑦CH3CHO→CH3COOH; ⑧MnO4-→Mn2+。

A．①④⑤⑦

B．②⑥⑧

C．①⑦

D．①③⑦

答案

答案：C

阅读理解
阅读理解。
                                          
     My name's Darning and I'm in Class One. I'm from China and I'm
Chinese. I'm from Beijing. Beijing is a big city. Lingling's in my class.
She's my friend.
                                           
     My name's Lingling. I'm not from England and I'm not English. I'm| Chinese. I'm in Class One. Darning is my friend. We're twelve years
old. He's from Beijing and he's in my class. We're good friends.
                                          
     My name's Wang Hui and I'm Chinese. I'm not from Beijing. I'm
from Shanghai. I'm thirteen years old. I'm in Class! One with Darning
and Lingling. They are my friends.
1. There are _____ boys. 
A. 1
B. 2
C. 3
2. Darning is from _____.
A. Jinan
B. Beijing
C. Nanjing
3. Lingling is _____ years old.
A. 10
B. 11
C. 12
4. Wang Hui is in _____.
A. Class One
B. Class Two
C. Class Three
5. These students are _____.
A. English
B. Chinese
C. boys
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单项选择题

据称，为员工编制可选择的工作时间表增加了作业效率，下列理论的潜在意义与之相一致的是：（）

A.激励---保健理论

B.X理论

C.公平理论

D.认知评价理论
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