下列图形中,对称轴条数最多的是( )
A.等边三角形
B.等腰梯形
C.圆
D.正方形
等边三角形有三条对称轴;
等腰梯形有一条对称轴;
圆有无数条对称轴;
正方形有四条对称轴.
故选C.
He collected information on 1,000 people, whose IQ when they were ten years old. [ ]
A. is tested
B. has tested
C. would test
D. had been tested
开创图文对照法编撰药学专著先例的是()
A.《神农本草经》
B.《本草经集注》
C.《新修本草》
D.《本草纲目拾遗》
E.《本草纲目》