急性左心衰竭表现为()
A.面色发红
B.呼吸频率增快
C.咳大量脓痰
D.端坐位
E.突发呼吸困难
参考答案:B, D, E
I would rather a cup of tea. [ ]
A. having
B. have
C. to having
六年级同学排队做广播操,每行人数和排成的行数成______比例,______随______的变化而变化,在变化过程中这两个量的______不变.