【单选题】According to the passage,the hunters imitate ostriches because_____.
A.
they want to gain the trust of their intended prey
B.
they would like to entertain each other after a hard day's work
C.
ostriches are easier to imitate than elands
D.
if seen they could hide their heads in the ground
【判断题】安全气囊只能一次性工作,而座椅安全带收紧器却可以多次重复使用。( )
【简答题】机器有三大特征: (1) 是一种人为的 __________ ; (2) 组成整体的各实物单元之间具有确定的 ____________ ; (3) 可以代替人的劳动,实现能量转换或完成有用的 _________ 。
【简答题】Even the agers are , and they don’t want to th eir parents.
【单选题】Why do Americans hurry at meals?
B.
They want to eat dinner slowly.
C.
They don't like to eat.
【单选题】[单-内科护理学] 患者男性,36岁,上腹部间歇性疼痛3年,空腹及夜间痛明显,进食后可缓解。3天前出现黑便,患者出现黑便的原因最可能是