人群感染疟疾后，获得的免疫力为()
A．一定的免疫力，但不持久
B．终生免疫
C．无免疫力
D．有交叉免疫
E．以上均不对
参考答案：A
—He, together with his parents _______ going to visit Shanghai in July. How about you?
—I'm afraid I have to stay at home _______.
A. are; on my own
B. is; by myself
C. is; by my own
D. are; on myself
液体复苏时，下列哪项不正确
A．主要目的是为了恢复有效循环容量B．液体复苏可参照各种公式C．受伤早期输液速度要快D．要严格按照公式补液E．输液速度和内容要根据临床表现随时调整
