题目内容
(请给出正确答案)
[单选题]
______ not for gravity, there would be lots of things we could not do.
A.If it is
B.Were it
C.If it being
D.It were
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A.If it is
B.Were it
C.If it being
D.It were
A.①②
B.①③
C.②④
D.③④
A.心率增快,每搏输出量变大
B.心率增快,每搏输出量变小
C.心率变慢,每搏输出量变大
D.心率变慢,每搏输出量变小
健身走和健身跑对人体生物功能的主要影响是增强(),并能使肌肉活动与植物性器官高度协调。
A、心肺功能
B、协调能力
C、灵敏素质
A.消除逆选择
B.节省保险费
C.保护年轻人
D.消除道德风险