—Where's Sam?
—He ______ for France. [ ]
A. had left
B. has left
C. left
D. will leave
答案:B
碾米常采用哪两种方法?
正常成年人胸廓的前后径左右径比值为
A.3:2
B.1.5:1
C.1:1
D.1:2
E.1:1.5