26.Our school plans a wide ______ of outings, such as performances, picnics, swimming and museum trips.
A.lot B.variety C.number D.amount
25.The police discovered the witness at the funeral, but it was not an _____ to talk at length about the case.
A.appointment B.event
C.incident D.occasion
24.The mayor _____ the police officer a medal of honor for his heroic deed in rescuing the earthquake victims
A.rewarded B.awarded
C.credited D.prized
23.When asked about the secret about staying young, he said that a balanced diet _____ with exercise was the recipe for a healthy life.
A.conducted B.concluded C.combined D.connected
22.Our manager is _____an important customer now and he will be back this afternoon.
A.calling on B.calling up
C.calling in D.calling at
第一节:多项选择(共10小题;每小题l分,满分l0分)
从A、B、C、D四个选项中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。
21.Chemicals in the body ______our food _____ into useful things.
A.break, into B.break, up
C.break, down D.break, off
21.(本小题满分13分)
设函数
(Ⅰ)求函数的单增区间和极值;
(Ⅱ)若对任意恒成立,求a的取值范围。
20.设数列的前n项和
(Ⅰ)求数列的通项公式;
(Ⅱ)若且b1=-3,求数列的前n项和Tn
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