第16题: [单项选择]下述哪项是不正确的 A. 人乳中电解质浓度远比牛乳低,与婴儿肾脏功能相适应 B. 人乳对酸碱的缓冲力低,不会影响胃液的酸度。 C. 人乳含钙量比牛乳大,因此钙的吸收好 D. 人乳铁吸收率远高于牛乳 E. 人乳锌吸收率明显高于牛乳 参考答案:C 答案解析:人乳中钙含量不如牛乳中高,但由于钙磷比例适当等原因,母乳中钙的吸收好。
第36题: [单项选择]If computers ______, many problems on space flight could not have been solved. A. had not been invented B. are not invented C. were not invented D. have not invented 参考答案:A 答案解析:[解析] 虚拟语气题。本题考查与过去事实相反的虚拟语气,其结构为“If I(we,you,he,they)+had+动词过去分词+I(we,you,he,they)could not+have+动词过