The drop-out rate of college students seems to go up because ______.
A.young people are disappointed with the conventional way of teaching
B.many young people are required to join the army
C.young people have little motivation in pursuing a higher education
D.young people don't like the intense competition for admission to graduate school
第2题
长期鼻饲者,胃管应多长时间更换一次
A.根据情况保留尽量长的时间
B.每周
C.每3天
D.每两周
E.每天
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