从装有5个红球和3个白球的袋中任意取4个，那么取道的“至少有1个是红球”与“没有红球”的概率分别为（ ）和（ ）。
1；0
-- Our English teacher tells us that ______ grammar is a good way to learn English.
--And our teacher says _____ also helpful to sing English songs.
A．study, that was
B．is studying, it’s
C．studying, it’s
D．studied, that was
社区感染性肺炎最常见的革兰阴性杆菌是
A．大肠埃希菌
B．肺炎克雷伯杆菌
C．铜绿假单胞菌
D．流感嗜血杆菌
E．嗜肺军团菌
