从行为获得的途径来看,小狗经训练能到报亭给主人买报纸,这一行为属于[ ]
A.社会行为
B.学习行为
C.先天性行为
D.迁徙行为
答案:B
We should spend as much time as we can English.
A.read
B.to reading
C.to read
D.reading
军团病的临床表现有()
A.肺炎型
B.发热型
C.肺外感染型
D.A+B
E.A+B+C