第3题: [单项选择]"You are very selfish. It's high time you ______ that you are not the most important person in the world," Edgar said to his boss angrily. A. realized B. have realized C. realize D. should realize 参考答案:A 答案解析:[解析] 该题为It's high time that…结构,从句中的谓语动词使用过去时表虚拟,故A项正确。类似的结构还有It's time that…和It's about time that…等。
第29题: [单项选择]配制100ml 25%金银花注射液(已知其 50%冰点为0.05℃),需加入多少克氯化钠才能配成等渗溶液 A. 0.70g B. 0.80g C. 0.81g D. 0.82g E. 0.85g 参考答案:E 答案解析:已知50%金银花注射液的冰点为0.05℃,则其25%注射液的冰点为0.05/2=0.025℃,加入等渗调节剂W=(0.52- a)/b=(0.52-0.025)/0.58=0.85g,E是正确的。