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 |
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I said hello to you in the street yesterday, but you ________ me completely.
—I'm sorry. Maybe I didn't notice you.
| A．cheated | B．hid |
| C．ignored | D．recognized |
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