单项选择题

设f(x)在其零点x∗邻近二阶可微,且f'(x∗)≠0,当初值在根附近选取时,Newton法至少是（）

A．线性收敛
B．超线性收敛
C．平方收敛
D．不收敛

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单项选择题

有机棉在自然耕作管理过程中，只是适当的使用化学试剂，用量低于普通棉纤维。

A．对
B．错

多项选择题

There are several kinds of healthier foods that we can from to control our blood pressure as well as blood sugar, such as ______. A.
foods with less salt and sugar B.
low-fat dairy products C.
healthy protein foods, less red meat; D.
whole grain bread