题目

第三部分：阅读理解（共20小题；每小题2分，满分40分）阅读下列短文，从每题所给的四个选项（A，B，C和D）中，选出最佳选项。 WASHINGTON/NEW YORK - US President Bush said on Monday that he wanted Osama bin Laden “dead or alive” for last week’s attacks on the World Trade Center and the pentagon, but many of Washington’s allies are cool on strikes against Afghanistan．Bush has named Saudi - born militant Osama bin Laden as a prime suspect, though he has provided no evidence for his claim． Still, he had been building public support for mili 已知点F为抛物线y2＝－8x的焦点，O为原点，点P是抛物线准线上一动点，点A在抛物线上，且|AF|＝4，则|PA|＋|PO|的最小值为 [　　] A．6 B． C．2 D．4＋2