滚法对体表应产生轻重交替的滚动刺激,前滚和回滚时着力轻重之比为()
A.2:1
B.3:1
C.4:1
D.5:1
参考答案:B
— Ten dollars, please!
— How terrible! I ______ bringing my wallet with me.
A.was forgetting
B.forgot
C.had forgotten
D.am forgetting
人力资源不是再生性资源。