目前，我国每年新增人口1200万人，主要原因是[ ]
A、人口死亡率低
B、人口出生率高
C、人口基数大
D、人口迁移数量大
答案：C
— Do you think it's a good idea to make friends with my students?
— _____, I do. I think it's a great idea. [ ]
A. Really
B. Obviously
C. Actually
D. Generally
急性肺栓塞时可能会出现（）
A.血压升高
B.心电图异常
C.PCWP升高
D.心脏增大
E.肺部啰音
