第8题: [单项选择]They must ______for us; let's hurry up. A. wait B. have been waited C. waited D. be waiting 参考答案:D 答案解析:[解析] 情态动词除了有时和动词的完成式构成谓语,表示“应当,想必已经”外,还可以和动词进行式构成谓语表示“应当正在,想必正在”。
A. They are very nice and comfortable. B. There are not enough trains. C. They often run behind schedule. D. They leave and arrive at the right time. 参考答案:D 答案解析:根据第五段They(the Japanese trains)always leave and arrive on time可知正确答案为D。
第19题: [单项选择]患者男性,60岁。实验室检查:血清Na+142mmol/L,K+3.6mmol/L,BUN6.5mmol/L,Ca2+2.82mmol/L,P1.05mmol/L,Alb45gL,AIP72U/L。该病人检查结果表现为()。 A. 慢性肾功能不全 B. 高钙血症 C. 低磷血症 D. 低钙血症 E. 高磷血症 参考答案:B