A:氢氧化铜溶于醋酸溶液中:Cu(OH)2+2H+==Cu2++2H2O
B:乙醛的银镜反应:CH3CHO+Ag(NH3)2OHCH3COONH4+NH3+Ag↓+H2O
C:苯酚钠溶液中通入少量二氧化碳:C6H5O-+CO2+H2OC6H5OH+HCO3-
D:丙烯聚合:
下列运算正确的是( )
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1. What a big ____________of America !
2. Tell me ______________about the Great Wall .
3. There are lots of ______________to see.
4. The American flag is red and blue and ___________________.
5. You can always see it , every day and __________________.