下列哪种情况使氧解离曲线右移（）。
A.CO2分压增高
B.CO2分压降低
C.pH升高
D.温度降低
E.2，3-DPG浓度降低
参考答案：A
近似数12.05不能由哪个数四舍五入得到[ ]
A.12.051
B.12.052
C.12.045
D.12.044
______ of the land in that district ______ covered with trees and grass.
A. Two fifth; isB. Two fifth; areC. Two fifths; isD. Two fifths; are
