____ English is much easier than speaking it.
A.Read
B.To read
C.Reading
D.Reads
答案:C
等腰三角形是轴对称图形,最多有 条对称轴.
肾实质回声强度是
A.高回声
B.中等回声
C.极高回声
D.较低回声
E.极低回声