二尖瓣关闭不全的杂音
A．向颈部传导B．向心尖部传导C．向左腋下传导D．局限在心尖部E．向剑突处传导
参考答案：C
I want to buy that kind of cloth because I _____ the cloth _____ well.
A have told; washed B have been told; is washed
C was told; washed D have been told; washes
肌原纤维的粗丝主要由下列哪种分子组成（）
A.肌动蛋白
B.肌球蛋白
C.原肌球蛋白
D.肌钙蛋白
E.肌红蛋白
