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【多选题】
食品添加剂按来源可分为（ ）。A.
天然提取物
B.
化学合成物
C.
类天然物质
D.
防腐剂
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【简答题】为什么说实现中国梦必须弘扬中国精神
【多选题】为什么说实现中国梦必须弘扬中国精神( )
A.
凝聚中国力量的精神纽带
B.
激发创新创造的精神动力
C.
推进复兴伟业的精神定力
D.
一个民族赖以生存和发展的精神支撑
E.
民族进步的灵魂、国家兴旺发达的动力
【单选题】对于线性规划问题的标准形式，【图片】，利用单纯形法求解时，每作一次换基迭代，都能保证它相应的目标函数值Z必为( )
A.
增大；
B.
不减少；
C.
减小；
D.
不增大
【单选题】A common misconception is that university hospitals are better than community or private hospitals. In fact, university hospitals have a lower survival rate for patients than do other hospitals. From ...
A.
Many doctors divide their working hours between a university and a community or private hospital.
B.
Doctors at university hospitals often earn less than doctors at private hospitals.
C.
University and community hospitals often cannot afford the elaborate facilities of private hospitals.
D.
The emphasis at many university hospitals is on pure research rather than on the treatment and care of patients.
E.
The patients who seek help at university hospitals are usually more seriously ill than those at private or community hospitals.
【单选题】The general at last got a chance to visit the village ______ he used to fight, ______ he had been dreaming of for years.
A.
that ... which
B.
where ...that
C.
in which ...that
D.
where ...which
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