风景名胜区划分等级的依据是（）。
A.按环境质量
B.按游览条件
C.按景物的观赏，文化，科学价值
D.按规模大小
参考答案：A, B, C, D
健康成人一次失血量不超过多少毫升可通过人体的代偿使之逐渐恢复而不用输血（）
A.600ml
B.1000ml
C.1500ml
D.2000ml
E.2500ml
— Fancy meeting you here!
— Pleased to see you. If they ________ me to the party, I ________ be here.[ ]
A. hadn't invited; wouldn't be
B. didn't invite; wouldn't be
C. hadn't invited; wouldn't have been
D. didn't invite; won't be
