下列计算正确的是 [ ]
A.a2+b3=2a5
B.a4÷a=a4
C.a2a3=a6
D.(﹣a2)3=﹣a6
答案:D
消谷善饥,兼见多饮多尿,消瘦者为()。
A.胃火炽盛
B.胃阴不足
C.脾胃虚弱
D.胃强脾弱
E.消渴病
I'd invite her ______ dinner at my house tomorrow. [ ]
A. have
B. having
C. has
D. to have