呼吸性碱中毒表现为：（）
A.HCO-3减少
B.HCO-3增高
C.PCO2增高
D.继发性H2CO3增多
E.PCO2下降
参考答案：E
若不等式|x+1|-|x-2|＞a在x∈R上有解，则a的取值范围是______．
Li Ke ___________runs in the morning, for he wants to be healthy.
A. never B. often C. hardly
