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C. /; a
D. /; / 2. —Who is at the door —A deliveryman( 快递员) or ______ wanting to sell his new products. A. everybody
B. anybody
C. somebody
D. nobody 3. —We have entered a world where robot operations become true with 5G technology. —Hard to believe! Scientists are full of ______ which leads to great changes in our life. A. attraction
B. invention
C. position
D. contribution 4. It’s a ______ idea to build cabin hospitals (方舱医院) to receive patients during the outbreak of COVID-19 (新冠肺炎). A. cheerful
B. classical
C. creative
D. curious 5. —Song of Autumn by Liu Yuxi describes autumn in a different way. —I
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