选出不同类的单词
A:reporter
B:plane
C:boat
D:bike
下列说法错误的是( )。
己知下列变化过程中,有一个RxO72﹣离子反应时,反应就转移6个电子,
RxO72﹣+ Fe2++ H+= R3++ Fe3++ H2O
给下列句子选择合适的答语。
① It's 7 o'clock ____ A. It's time for English class.
② It's 9 o'clock ____ B. It's time for breakfast
③ It's 5 o'clock. ____ C. It's time to go home.