关于支气管哮喘，哪项概念是错误的（）

A.可见于儿童和青年

B.呼气性呼吸困难

C.支气管黏膜下迷走神经感受器易感性增高

D.α-肾上腺素受体功能相对增强

E.发作与细胞免疫无关

There used to be no deer _____ in the forest, but now they are very_____ in it. [ ]

A. alive; common

B. living; usual

C. live; ordinary

D. living; common