There ______________ a pen and two books on the desk. [ ]
A. is
B. are
C. was
D. were
答案:A
心烦心悸、健忘而不寐,多为()
A.心脾两虚
B.心肾不交
C.痰热扰心
D.心胆气虚
E.气虚血瘀
只要物体在地球附近,无论物体与地球接触与否,都受到重力的作用。()