Severe winter storms have worsened the nation’s usual post-holiday blood shortage,【C1】________an urgent call today for people to

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问题     Severe winter storms have worsened the nation’s usual post-holiday blood shortage,【C1】________an urgent call today for people to donate blood. Type O blood is the most urgently needed, because it is the【C2】________blood type, meaning it can be safely【C3】________to most people in an emergency. "The severe winter weather has forced the cancellation of blood drives and limited our【C4】________to collect blood," American Red Cross President Elizabeth Dole said. The Red Cross reported having less than one day’s supply of Type O blood on hand in 18 of the organization’s 38 collection regions. The Red Cross【C5】________about half of the nation’s blood supply. America’s Blood Centers, which supplies most of the rest, also has reported shortages.
    Reacting to the shortage, a Pittsburgh blood bank asked 40 hospitals in western Pennsylvania, West Virginia and Ohio to【C6】________elective surgeries through Wednesday. At least 1,000 donors are needed each day for the next several days to stabilize the supply, said Mark Lynch, spokesman for the Central Blood Bank. "We’re talking about (postponing) hip replacement, for example, and orthopedic cases. These are sick people who need surgery, but it’s not life【C7】________," he said. When its blood supply is【C8】________, the blood bank needs about 700 donors each day to maintain normal inventory. The Pittsburgh blood bank last asked hospitals to postpone elective surgeries because of a blood shortage in October 1995. Such procedures were canceled for almost a week.
    Nationwide, donations typically fall off during the holidays, when donors become too busy to give blood【C9】________. Bad weather increases shortages both by【C10】________blood drives and by causing increased blood demand to treat accident victims.
    A) threatening    F) ability       K) immediately
    B) popular        G) universal     L) prompting
    C) postpone       H) refuse        M) blocking
    D) regularly      I) transfused    N) density
    E) receives       J) stable        O) provides
【C5】

选项

答案O

解析 分析句子主干,本句缺少谓语动词。根据主语the Red Cross和句子时态可知,空格处应填动词的第三人称单数形式。符合语法条件的有两个选项:receives和provides。显然只有provides符合句意:“红十字会提供美国约一半的用血”。故选O。
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