慢性持续期是指近几个月内不同频度和(或)不同程度地出现过喘息、咳嗽、气促、胸闷等症状?()
A.3
B.4
C.5
D.6
参考答案:A
It was Sunday and there were so many people in the streets that he found it difficult
to _____ to the post office. [ ]
A. make his way
B. find his way
C. feel his way
D. lose his way
()是美术教育的发源地。
A.中国
B.德国
C.美国
D.日本