设函数f（x）=ax2+bx+c（a，b，c∈R），若x=-1为函数f（x）ex的一
题型：单项选择题
问题：
设函数f（x）=ax2+bx+c（a，b，c∈R），若x=-1为函数f（x）ex的一个极值点，则下列图象不可能为y=f（x）的图象是（）.
A.选项A
B.选项B
C.选项C
D.选项D
题型：单项选择题
根据短文提示,请将下列的图片所代表的地点按Uncle Michael的行程顺序排列.
Uncle Michael likes going sightseeing for vacation .His office is in New York,
but he usually travels from one place to another. Last Monday he was in Tokyo.
Three days later he was in Australia. The day before yesterday he was in
Beijing . Last night he was in Shanghai. But now he is on the way to Tibet. He is
going there for a week. How busy he is !
A
B 
C 
D 
E 
F 
正确顺序:B→(66 )→ (67 )→ ( 68 )→( 69 )→ ( 70 )