In the rice-growing world Chinese scientist Yuan Longping is leading figure.A. a; the

问题补充：

In the rice-growing world, Chinese scientist, Yuan Longping, is leading figure.

A. a; the

B. the; a

C. a; a

D. the; the

答案：

A. a; the

(答案→)B. the; a

C. a; a

D. the; the

解析：定冠词the表特指，用在表示特制的人或物的名词前，本题中特指中国科学家。不定冠词a、an表泛指，表示one、the same或every的意思。本句含义，在水稻种植领域，中国科学家袁隆平是一位杰出人士。故应选B。

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