1.【2012安徽卷】21. Carl is studying food science at college and hopes to open up meat processing factory of his own one day.
A. / ； a B. / ；the C. the ; a D. the ; the
2.【2012重庆卷】35.—Look, here comes your dream girl. Invite her to dance.
—______W hat if she refuses me?
A.I don’t know B. Why me? C. With pleasure D. So what?
3.[2013•湖北]22 Carbon dioxide, which makes a ________ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.
A．difference B．comparison
C．connection D．barrier
