—Do you have any idea why Mark is leaving?

—No. In fact，everyone is _________about it.

A．doubtful

B．curious

C．enthusiastic

D．annoyed

我国领土东西端的晨昏差异比较明显的根本原因是（　　）

A．疆界长，邻国多

B．地方时差异明显

C．南北纬度相差大

D．东西经度跨越范围广大