题目内容

A about one percent of the total population
B to be responsible for childhood leukaemia
C an urgent and tough task to be accomplished
D less than one third of the minimum
E an expensive cost to be paid
F to afford the cost of bone marrow transplantation
It seems that many of the recipients are not rich enough ______.

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When is the time your cycle of body temperature is at its peak？ It is ______.

社会交往上需要投资时间。()

If you have may concern about a new drag or its side effects, you can ask your doctor or pharmacist questions, or call the drug company for ______.

地下浅孔爆破采场，装药前应检查____，确认无浮石、无冒顶危险方可开始作业。
A 采场顶板
B 炮孔
C 采场底板