—Where are you going during the summer vacation?

—I’ve found a nice beach ________ I can enjoy swimming.

A．that

B．when

C．where

D．which

苯丙酮尿症患儿智力低下的表现多在何时被发现

A.新生儿期即被发现 

B.出生后4个月左右 

C.出生后8个月左右 

D.出生1年左右 

E.出生后2～3岁