第一节(共5小题;每小题1.5分)请听下面5段对话,选出最佳选项。
1. Which place hasn’t Sara been to?
A. New York. B. Beijing. C. Tokyo.
2. What marks did Linda get in her exam?
A. 90. B. 98. C. 95.
3. How much is the red bag?
A. 6 dollars. B. 4 dollars. C. 5 dollars.
4. Why does the woman think the book good?
A. It solves many problems about study.
B. Many of them are also reading it.
C. It helps them a lot when they study.
5. What does the man mean?
A. He is sitting on the chair. B. The chairs are not free. C. The chairs are broken.
22、OH- Cl- K+; 铁粉; Ag(或银);
Ag+ Fe3+ Cl- OH-; KNO3
21、(1)Fe2+、Fe3+、Cu2+、MnO4- (2)NH4+、Mg2+、Al3+ (3)S2-、CO32-、HCO3-(4)Ba2+、 SO42-
(5)Cl-、NO3-、Na+
20、① H2O2 + 2I- + 2H+ = I2 + 2H2O ② +2价
19、(1)含有Ba2+、Ca2+离子中的一种或两种,因为BaSO4不溶于水,CaSO4微溶于水。 (2)Fe(OH)3
(3)2AlO2-+CO2+3H2O=2Al(OH)3↓+CO32-
或AlO2-+CO2+2H2O=Al(OH)3↓+HCO3-
13、A 14、B 15、C 16、C 17、A 18、A
7、D 8、AB 9、C 10、 C 11、AC 12、C
1、D 2、C 3、AC 4、C 5、D 6、D
5、(1) Ba2++2OH-+2H++SO42-==BaSO4↓+2H2O
(2)Ba2++OH-+H++SO42-==BaSO4↓+H2O
(3)Ba2++OH-+H++SO42-==BaSO4↓+H2O
(4)OH-+H+==H2O
检测提高
1、C 2、AD 3、AC 4、A
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