The word "incorporate" in the passage is closest in meaning to
A. describe
B. include
C. expand
D. present
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GB5009.33-2010规定，用分光光度法测定速冻菠菜中的硝酸钠时，样品经沉淀蛋白质后，为了使硝酸根离子还原成亚硝酸根离子，可将溶液()。
A. 沉淀
B. 通过镉柱或加入镉粉
C. 过滤
D. 加入铁粉
感官检定时，()对检验员的视力有一定的要求。
A. 气味
B. 杂质
C. 滋味
D. 组织状态
You may fly to Japan next Saturday,() you don't mind changing planes on the way.
A. as far as
B. unless
C. supposing
D. provided
My stomach hurts. I feel sick. —For safety's sake, ().
A. go to see a doctor tomorrow
Better to go to hospital
C. you'd better see a doctor at once
D. Quick go to hospital
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