肺活量是指
A．深吸气量加补呼气容积B．深吸气量加补吸气容积C．补吸气容积加补呼气容积D．潮气容积加补吸气容积E．潮气容积加补呼气容积
参考答案：A
In most western countries on April Fool's Day, people often play________trick on each other; children
especially have great________fun.[ ]
A. a; a
B. the; the
C. /; a
D. a; /
感染人的禽流感病毒亚型为H5N1、H9N2、H7N7、H7N2等，其中感染（）的患者病情重，病死率高。
A.H5N1
B.H9N2
C.H7N7
