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第一节：单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项, 并在答题卡上将该项涂黑。
21. ---- Really? Who will give _________ lecture?
---- Mr. Wang, ________ professor from Nanjing University.
A. the; 不填 B. a; the C. the; a D. a; a
22. Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _______ introduced the idea in 1953 _______ aspirin could reduce the risk of heart attacks.
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项, 并在答题卡上将该项涂黑。
21. ---- Really? Who will give _________ lecture?
---- Mr. Wang, ________ professor from Nanjing University.
A. the; 不填 B. a; the C. the; a D. a; a
22. Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _______ introduced the idea in 1953 _______ aspirin could reduce the risk of heart attacks.
