男性，汽车司机，因交通事故致肝破裂。入院时血压80/60mmHg，脉搏120次/min，神 志尚清，口渴，肤色苍白，尿少，估计失血量为 （ ）
A.300～500mL
B.1500～2000mL
C.800～1600mL
D.600～1000mL
E.2000mL以上

多项选择题以下关于节俗的说法正确的是：

单项选择题We all need (11) ．Doctors say it is good (12) 0ur (13) ．It makes your heart and body strong． And you'll (14) better about yourselF.It's best to exercise(15) a week．Twenty minutes each time is enough．There are (16 ways to exercisE.You can walk， (17) ，play football or swim Many people go to special places to exercisE.They are called 'fitness centers ． These places have (18) equipment． Some people buy equipment(器械) for their families， But it is very expensivE.Exercising can be fun． Friends can exercise together (19) a fitness center． How do you exercise? How (20) do you exercise?( )11．A.exercisingB.exercisesC.to exerciseD.exercised