【单选题】The problem with people in Africa ____that the more is given and the more ______.
【单选题】The reason for a rapid growth of population lies in the fact that __________.
A.
people are permitted to have more children
B.
people can live better than before
C.
newborn babies die less than before
D.
we have found the secret of longevity
【判断题】违法行为是指旅游法律关系主体违反旅游法律法规所实施的行为。( ) A.正确 B.错误
【多选题】文旅融合发展,将迎来 ( )的良好机遇。(题库2019)
【判断题】旅游法律关系是因旅游法律法规调整而产生的旅游各方当事人之间的权利义务关系。()
【判断题】设∑为球面 为∑在xoy平面上的投影区域,则 ( )