Some students think it is ___ to spend some time surfing the Internet, but we shouldn’t be too dependent on it.

A．worth

B．worthwhile

C．worthy

D．worthy of

晚期妊娠时 * * 无痛性流血，首先应考虑

A．脑积水

B．羊水过少

C．前置胎盘

D．环形胎盘

E．胎儿发育迟缓