提一桶水上楼，这时手臂上肱二头肌和肱三头肌的状态分别是（ ）
A．收缩，收缩
B．收缩，舒张
C．舒张，收缩
D．舒张，舒张
答案：A
—There are 60 students in my class and 44 of them use weibo veryoften.
—44? That means about_______of your classmates are weibo users, right?
A．half
B．one third
C．two thirds
D．three quarters
对心跳呼吸骤停的初期复苏措施中，不包括（）。
A.解除舌后坠
B.清除分泌物或呕吐物
C.口对口人工呼吸
D.心脏按压
E.留置导尿管
