流感的流行病学特征有()
A.甲型、丙型流感易引起流行
B.经空气飞沫传播
C.多发生在春季
D.患者及隐性感染病毒携带者是主要传染源
E.不同亚型之间有交叉免疫
参考答案:B, D
上海菜的特色是()。
A.浓油赤酱
B.汤卤醇厚不腻
C.咸淡适口
D.用鱼虾、蔬菜为原料
E.烹调以红烧、蒸等见长
There were _____ students in the hall that you could hardly breath! [ ]
A. such many
B. such a lot of
C. very many
D. so a lot of