Nowadays, older _______ people don't use"How do you do?"among themselves
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The Millers often _______barbecue during the week
When you see somebody you know after a short _________time,say"How are you?”
绒毛膜促性腺激素(HCG)与妊娠期间分泌量达高峰的时间是
A. 妊娠5～7周
B. 妊娠8～10周
C. 妊娠11～13周
D. 妊娠14～16周
E. 妊娠16~18周
脐带中的静脉有
A. 4根
B. 3根
C. 2根
D. 1根
E. 5根
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