【单选题】The destruction of our natural resources and contamination of our food supply continue to occur, largely because of the extreme difficulty in affixing(附加) legal responsibility on those who continue to...
A.
they are unaware of the consequences of what they are doing
B.
they are reluctant to sacrifice their own economic interests
C.
time has not yet come for them to put due emphasis on it
D.
it is difficult for them to take effective measures
【单选题】通常在内陆较干燥的地区,相对湿度的日、年变化规律与()。
【单选题】患者,男,59岁,长期应用抗生素,口腔内有霉菌感染,口腔pH值偏酸性。为该病人进行口腔护理时,适宜选择的漱口液为()
【单选题】随着任务难度的增加,最佳动机水平将( )