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【简答题】
已知函数f（x）=x 3 +ax 2 -2ax-3a，（a∈R）． （Ⅰ）若f（x）在x=2处的切线与直线x+6y=0垂直，求a的值． （Ⅱ）证明：对于?a∈R都?x∈[-1，4]，使得f（x）≤f′（x）成立．
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【简答题】用be动词的适当形式填空。 1. What _____ your name? 2. My telephone number _____ 2746598. 3. This _____ my ID number. 4. My family name _____ Black. 5. Helen and Gina _____ girls.
【单选题】I was never_____ t o receive a _____ result from my science teacher.
A.
surprised; disappointed
B.
surprised; disappointing
C.
surprising; disappointed
D.
surprise; disappointing
【单选题】We thought Tom wouldn't pass the exam, but to ___, he passed.
A.
the surprise
B.
my surprised
C.
our surprise
D.
our surprising
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