腹痛剧烈，鼻流粪水，直肠检查可摸到后移的胃，常提示( )。

A．大肠阻塞

B．骨盆曲阻塞

C．急性胃扩张

D．食道阻塞

E．胃炎

The thought _____ they could cross the whole continent was exciting.

A．that

B．what

C．which

D．why