—Why did Jack look upset?

—He was pretty ______ at the ______ news．

A．disappointed，disappointed

B．disappointing，disappointing

C．disappointing，disappointed

D．disappointed，disappointing

造成伦敦烟雾事件的大气污染物是

A．氮氧化物

B．碳氢化物

C．烃类化物

D．烟尘利二氧化碳

E．多环芳烃化合物