学龄儿童正常心率是()
A.120~140次/分
B.110~130次/分
C.100~120次/分
D.90~100次/分
E.70~90次/分
参考答案:E
— Did you watch the opening of Winter Olympic games?
— No, I didn’t. I ______ on the Internet.
A.study
B.have studied
C.am studying
D.was studying
可能导致葡萄胎发生局部侵犯或远处转移的高危因素有哪些?