①CH3CH=CH2+Br2→CH3CHBrCH2Br
②CH3CH2OH CH2=CH2↑+H2O
③CH3COOH+CH3CH2OH CH3COOCH2CH3+H2O
④C6H6+HNO3 C6H5NO2+H2O
A:①②
B:③④
C:①③
D:②④
①河水碧绿碧绿的,微风吹过,泛起层层波纹。
②路的一边是田野,葱葱绿绿的,非常可爱,像一片柔软的绿毯。
—China is getting better and better at making high technology products.—That's right. People around the world can hardly avoid________ products made in China.
﹣14的相反数是____