心肺复苏时，成人使用2L简易呼吸器挤压（）
A、1/2
B、1/3
C、2/3
D、3/4
参考答案：B
—Why do you want to learn French?
—I think it is fun _____ language after English. [ ]
A. to learn a
B. learn a
C. to learn another
D. learning another
丕平献土
