There is no difference between natural vitamins and synthetic vitamins. The synonym of "synthetic" is （）.
A. artificial
B. rhetoric
C. practical
D. theoretical
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中国第一个神经科学研究机构——北京神经外科研究所诞生在（）
A. 阜外医院
B. 安贞医院
C. 宣武医院
D. 同仁医院
通州素有（）之称。
A. 北京粮仓
B. 京东粮仓
C. 京南之户
D. 路上码头
The Normans invaded England in 1066. The Norman Conquest started a continual flow of ______ words into English.
A. French
B. Greek
C. Roman
D. Latin
Which of the following words is NOT formed through clipping（）
A. Dorm.
B. Motel.
C. Gent.
D. Zoo.
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