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【单选题】
设函数 ,其中函数 在原点的某个邻域内连续,且 ,则在原点 处( )A.
的两个偏导数都不存在
B.
当 存在时,
C.
在 处不可微
D.
在 点处 可微,且
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反馈参考答案：
举一反三
【简答题】根据汉语写出正确的单词。 1. Do you like _________ (花椰菜)? 2. He doesn't like _________ (草莓). 3. They don't like _________ (炸薯条). 4. Let's have some _________ (鸡肉). 5. Does she like _________ (西红柿)?
【简答题】看图完成句子。 1. I like _______. 2. They don't like _______. 3. She likes _______. 4. Most students like _______. 5. Every child likes _______.
【单选题】Why doesn't the girl like the brown leather wallet ?
A.
. There isn't a place to put pictures .
B.
. It's too big and heavy .
C.
. She doesn't like the color .
【单选题】Lucy _____ computer games. [ ]
A.
don't like
B.
isn't like
C.
does't like
D.
not like
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