①硝酸铵和水;②铁和稀硫酸;③固体氢氧化钠和水;④生石灰和水;⑤石灰石和稀盐酸.
A:①②③④⑤
B:②③④⑤
C:②③⑤
D:②④⑤
—It's seven o'clock. It's time to go _______.
—OK, let's go.