第2题: [单项选择]The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished. A. had they been done B. they had been done C. having been done D. they were done 参考答案:A 答案解析:[考点] 考查虚拟语气。 虚拟条件句中有were，had，should时，可将if省略，把were，had，should放在主语前，构成倒装结构，主要用于书面语中，如：Were it nec
第3题: [单项选择]机体酸碱平衡的调节不包括______ A. 酸性物质进入血液的缓冲 B. 碱性物质进入血液的缓冲 C. 肺排出CO2 D. 肺吸入氧气 E. 肾排出非挥发性酸、碱物质 参考答案:D 答案解析:本题主要考查的知识点是机体酸碱平衡的调节。 机体酸碱平衡的调节包括酸、碱物质进入血液等体液的缓冲、肺及时排出CO2及肾排出非挥发性酸、碱物质3个方面。
