题目内容

William the Conqueror and Edward the Confessor were cousins.

A. 对
B. 错

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King John was williing to sign the Great Charter.

A. 对
B. 错

King Alfred was the father of English navy.

A. 对
B. 错

King Arthur was an Anglo-Saxon king.

A. 对
B. 错

函数在［ａ，ｂ］上一定有

A. 极大值；
B. 最大值；
C. 极大值和最大值；
D. 以上说法都不对．