常用的抗血小板聚集药物有（）
A.阿司匹林
B.双嘧达莫
C.噻氯匹啶
D.氯吡格雷
E.低分子肝素
参考答案：A, B, C, D
—He, together with his parents _______ going to visit Shanghai in July. How about you?
—I'm afraid I have to stay at home _______.
A. are; on my own
B. is; by myself
C. is; by my own
D. are; on myself
从历史发展看，中国人衡量食品质量的第一标准是（）
A.食量
B.食形
C.食境
D.食味
