以下是一个化学反应前后分子种类变化的微观示意图：
下列有关说法正确的是
| A．图④是水分子的模型图 |
| B．该反应中元素的种类发生改变 |
| C．图①中氮、氢两元素的质量比为1:3 |
| D．该反应是复分解反应 |
late again, Bill!
| A．Don’t to be | B．Don’t be | C．Not be | D．Be not |
the radio, please. The baby is sleeping now.
A.Not turn on B.Don’t turn on
B.Not turn downD.Don’t turn down
Nice you!
| A．to meet | B．meeting | C．met | D．to meeting |
full basket it is!
| A．What | B．What a | C．How | D．How a |
salty the egg is!
| A．How | B．How a | C．What a | D．What |