题干
The man likes giraffes _____ they are very interesting.
A：because
B：because of
C：so
D：but
答案(点此获取答案解析）
A
The man likes giraffes _____ they are very interesting.
A：because
B：because of
C：so
D：but
D在某段时间内以A的浓度变化表示的反应速率为1 mol•L-1•min-1，则此段时间内以C的浓度变化表示的化学反应速率为（ ）