题干
-- Attention, please! I have good news for you about your flight.
-- ?
A：What are they
B：Where is it
C：How are you
D：What is it
答案(点此获取答案解析）
D
-- Attention, please! I have good news for you about your flight.
-- ?
A：What are they
B：Where is it
C：How are you
D：What is it
同时加入质量不等的锌粒，反应结束后得到等量的氢气。下列说法正确的是