x、y两数和的平方可以表示为[ ]
A.x2+y2
B.x+y2
C.x2+y
D.(x+y)2
答案:D
Tom's mother kept telling him that he should work harder, but ______ didn't help. [ ]
A. he
B. which
C. she
D. it
梅尼埃病有两个特殊类型,分别是()
A.vanderHoeve综合征
B.Cogan综合征
C.Tumarkin危象
D.Lexmoyez综合征
E.Hunt综合征