单项选择题

CO2在血液中运输的主要形式

A.物理溶解
B.C2CO3
C.HCO3-
D.HbNHCOOH
E.HbCO2
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心肌细胞有效不应期特别长的生理意义
A.使心肌不发生强直性收缩
B.使心肌“全或无”式收缩
C.使心肌收缩更有力
D.使心肌产生自动节律性兴奋
E.使心肌同步收缩
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The Americans believe that anybody can become President of the United States. In a recent Hollywood comedy（喜剧）, that is exactly what happens.Dave Kovic, played by Kevin Kline, is a kind-hearted man who runs a business that finds people jobs. He leads a typical（典型的） American way of life, except for one thing－he looks exactly like the President, Bill Mitchell. In fact, the only thing that makes him different from the nation's leader is that he is very nice!The president has started using look-alikes during some public appearances. Dave is offered a chance to serve his country by becoming . However, things go wrong. The President becomes very ill and Dave ends up acting as the President forever.Director Ivan Reitman, who made the popular and successful comedies like Twins, Ghostbusters and Legal Eagles, could have gone for easy laughs by making fun of the American government. Instead, Dave is an attractive comedy about an ordinary man in extraordinary situations. Kevin Kline gives a double performance as Dave and the President, and Sigourney Weaver is at her best as his First Lady. The love story that develops between her role and Dave isa real classic （经典） .The film is 100％ American. However, if you've ever felt that anybody could do a better job running the country than the people in power, then you'll enjoy Dave !Which of the following is best supported by the text?（
A.Theauthorthinkshighlyofthefilm
B.TheauthorisafanofHollywoodcomedies
C.TheauthorwishestobecometheAmericanPresident
D.TheauthormakesfunofthePresident
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