题目:
Greater efforts to increase agricultural production must______if food shortage is to be avoided.
A.be made
B.make
C.have made
D.have been made
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A解析:尿β2-MG增高反映肾小管重吸收功能受损,尿白蛋白增高反映肾小球滤过膜屏障功能受损。