—Could you tell me what time the train leaves Hefei for Beijing
—I'm afraid you need to ______ on the internet.

A. look for it
B. look at it
C. look it over
D. look it up

作用于α、β不饱和内酯环的反应是

A．Liebermann反应
B．SalkOwski反应
C．Tschugaev反应
D．Legal反应
E．对硝基苯胺反应