损伤外因是指（）
A.外感六淫及邪毒感染
B.外力伤害
C.饮食饥饱
D.七情所伤
E.房室所伤
参考答案：A, B
________ of the trees are planted by the students in our school in the park. [ ]
A. Two-third
B. Two-thirds
C. Second-thirds
D. Two-threes
工具应放在床身导轨上。( )
