John seemed puzzled about _____ the question meant.

A．how

B．why

C．what

D．Which

一早产男婴，重1350g，出生后住在隔离病室。对该患儿应采取的隔离是（）

A.接触隔离

B.严密隔离

C.保护性隔离

D.呼吸道隔离

E.血液-体液隔离