向pH为4的盐酸中加入下列物质，混合后溶液的pH可能会减小的是（

【名词&注释】

氢氧化钠溶液(sodium hydroxide solution)、实际电功率

[单选题]向pH为4的盐酸中加入下列物质，混合后溶液的pH可能会减小的是（ ）

A. 纯水
B. 氢氧化钠溶液
C. pH为4的盐酸
D. 硫酸溶液

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学习资料：

[单选题]标有“6V 3W”的甲灯和“12V 12W”的乙灯，并联接在6V的电源上（假设灯丝的电阻不变），下列说法正确的是

A. 甲、乙两灯消耗的电能之比是1:4 B． 甲、乙两灯的电阻之比是1:2
B. 通过甲、乙两灯的电流之比是1:2
C. 甲、乙两灯的实际电功率之比是1:1

[单选题]B"Well ,we're in our new house． Let's get a new pet to go along with it．Mrs Brown said to her husband．

A. "Do you want to see the ads in the newspaper?"
B. Many pets there need homes． Since tomorrow is Saturday, we can both go ,"she said．
C. "We want to be sure that the pets here go to good homes ,"Mr Snow said ,"so I need to ask you some questions． " After they talked for a while ,the Browns decided to get a small dog． It wouldn't need-a big
D. After Mr Snow gave the Browns a book on pet care ,they chose one and wanted to take her home right away． But the animal doctor hadn't checked her yet． So Mrs now told them to return on Sunday．
E. The animal doctor said, "Shadow has had all of her shots(预防针)． She will be healthy． "The Browns thanked the doc- tor and took Shadow home．
F. From the reading we learn that_________ ．
G. the Browns have never had a pet before
H. the Browns knew about Shadow from the newspaper
I. Shadow is a small and healthy dog
J. Mr Brown didn-t quite agree with his wife

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