关于蜱传回归热的传染源,下面错误的是()
A.患者是主要传染源
B.鼠类
C.牛和羊
D.马和驴
E.狗、狼及蝙蝠
参考答案:A
—What would you send to your sister as the Christmas gift?
—I haven't decided yet .I _ send her a handbag. [ ]
A. shall
B. may
C. must
如图是肺的吸气和呼气过程的模型图,下列说法正确的是( )
A.甲表示胸廓扩大,肺收缩呼气
B.甲表示胸廓缩小,肺收缩吸气
C.乙表示胸廓扩大,肺扩张吸气
D.乙表示胸廓缩小,肺扩张呼气