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七选五 Crossroads International 1. How does Crossroads work? Crossroads is a resource network.We take goods Hong Kong doesn't want and give them to people who badly need them.We collect those goods and give them out in the welfare arena (福利院) in Hong Kong, Mainland China, elsewhere in Asia, Eastern Europe and Africa. __ 1 ____ 2. Who do we help? __ 2 __  They are grassroot groups who have seen a need and tried to meet it.They can't get the job done without backup, though, so our task is to help them do their task.Our warehouse is full of goods, from computers to high chairs, clothing to books, stationery to medical provision, cupboards to dining sets.They send us a list of their needs and we try to match it with the resource we have in stock. 3.  __ 3 __ Crossroads itself also operates on a low budget.We do not buy the goods we send.They are donated. __ 4 __   Nobody in our organization receives a salary.Even our fulltime staff work on a voluntary basis. Those that donate goods and services: ●Factories                       ●Manufacturers ●Hospitals                       ●Hotels ●Educational Institutions  ●Householders ●Transport Companies    ●Offices ●Other Charities __ 5 __  While we receive large quantities of goods and there is never a short supply of requests for them, we are always in need of hands to help sort and prepare them for shipping. A.One resource that we are always in need of is people. B.So Crossroads is just that: a Crossroads between need and resource. C.What can I do? D.The welfare agencies we help do not run on large budgets. E.How do we operate? F.All volunteer work is done at our warehouse. G.Similarly, rather than raising funds for freight (货运), we ask transport companies to donate their services.
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【单选题】快速幂求x^n的时间复杂度为O()
A.
n
B.
logn
C.
nlogn
D.
n^1/2
【单选题】糖类用水作提取剂时,温度一般控制在( ),提取效果好。
A.
20-30 ℃
B.
40-50 ℃
C.
80 ℃以上
D.
60-70 ℃
【单选题】快速幂的时间复杂度为()
A.
O(n)
B.
O(nlogn)
C.
O(logn)
D.
O(n^2)
【多选题】目前预防丙型肝炎的措施是:
A.
隔离病人
B.
积极治疗病人及病毒携带者
C.
加强医院内消毒隔离及严格筛选献血员
D.
丙种球蛋白被动免疫
E.
给予抗病毒药物预防
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A.
正确
B.
错误
【单选题】糖类用水作提取剂时,温度一般控制在( ),提取效果好。
A.
40-50 ° C
B.
60-70 ° C
C.
20-30 ° C
D.
80 ° C
【单选题】用水用作糖类物质的提取剂时,温度一般控制在(),提取效果较好。
A.
30~40℃
B.
40~50℃
C.
60~80℃
D.
80~90℃
【判断题】动物细胞培养所需的气体中没有二氧化碳。
A.
正确
B.
错误
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