男，35岁，间歇性上腹痛2年，有嗳气，食欲缺乏，每于受凉后加剧。近7天来疼痛加剧，并

This kind of animal is able to protect itself from danger in many years. ________, the colouring of its hide makes it almost invisible when it is feeding in the shadow of trees.

A．First at all

B．First of all

C．In all

D．At all

—Could I go boating this weekend, Dad?

—Yes, you ________. But you have to come back before lunch. [ ]

A. can

B. must

C. need

D. should

已知运输条款CY－CY，提单记载装船港、卸船港、一程船、二程船，该提单是（）。

A．直达海运提单

B．海海转运提单

C．海海联运提单

D．多式联运提单

图例是指在图纸上所确定标出电气设备的安装高度或线路的敷设高度。( )