股四头肌可（）
A.屈膝关节
B.伸膝关节
C.膝关节旋内
D.膝关节旋外
E.限制伸膝关节
参考答案：B
Her many talents were ___________all her friends. [ ]
A. envy among
B. the envy of
C. the envy at
D. envy it
咳浆液性粉红色泡沫样血痰的疾病是
A．肺炎
B．肺结核
C．肺梗死
D．白血病
E．急性肺水肿
