It was ____terrible earthquake and _____number of people who were killed reached more than 20,000.

A．a; the

B．the; a

C．the; the

D．a; a

下列物质分子中，中心原子以sp杂化轨道成键．分子的空间构型是直线型的是( )。

A．BeCl₂
B．BF₃
C．SO₂
D．NH₃