-- What’s your plan for this winter vacation?

-- I’ll take an express train to Dalian for my holiday ______ school ends．

A．while

B．until

C．immediately

D．unless

小儿实证便秘伴腹痛宜选用（）

A.拿精宁

B.拿肚角

C.拿肩井

D.掐合谷