评价气流受限的敏感指标()
A.FEV/FVC
B.FEV%预计值
C.FEV/FVC<70%及FEV<80%预计值
D.RV/TLC增高
参考答案:A
Lisa wrote a letter in the morning, but Bob _______.
A.doesn’t
B.don’t
C.didn’t
D.wasn’t
The ship sailed _____ Xiamen _____ 30 miles an hour.
A.for, at
B.to, at
C.to, by
D.for, by