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[主观题]
I like ______ the clouds at sunset because it seems relaxing.A.watchB.to watchC.watchedD.w
I like ______ the clouds at sunset because it seems relaxing.
A.watch
B.to watch
C.watched
D.watching
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I like ______ the clouds at sunset because it seems relaxing.
A.watch
B.to watch
C.watched
D.watching
A.Na+、Ba2+、Cl?、SO42-
B.Ca2+、HCO3?、C1?、K+
C.MnO4?、K+、I?、H+
D.H+、Cl?、Na+、CO32?
A.2Fe3++SO2+2H2O═2Fe2++SO42﹣+4H+
B.2Fe2++I2═2Fe3++2I﹣
C.I2+SO2+2H2O═H2SO4+2HI
D.H2O2+SO2═H2SO4
A.饱和氯水中:Cl﹣、NO3﹣、Na+、SO32﹣
B.(OH-)=1.0mol•L﹣1溶液中:ClO﹣、K+、SO42﹣、Br﹣
C.Na2S溶液中:SO42﹣、K+、Cl﹣、Cu2+
D.pH=12的溶液中:NO3﹣、I﹣、Na+、Al3+
A.①②
B.①③
C.②④⑤⑥⑦
D.①③⑤