单项选择题
1、 已知n=(3，2)，b=(-4，6)，则(a，b)=  （     ）
 


2、 若f(x+1)=1/2f(x)，则函数f(x)可以是    (  )
A．
B．
C．
D．


3、 我国新疆地区修建的坎儿井工程，其主要作用是（　　）
A．调节大气的水汽
B．增加降水量
C．减少地下径流
D．减少蒸发量


4、阅读下列短文，回答题。
     Most musicians agree that the best violins(小提琴) were made in Cremona, Italy, about 200years ago． They even sound better than violins made today． Violin makers and scientists try to makeinstruments(乐器)like the Italian violins,however,they are not the same． Why are these old Italianviolins so special? No one really knows． But many people think they have an answer．
     Some people think it is the age of the violins． But there is a problem here． Not all old violins
     sound wonderful． Only the old violins from Cremona are special． So age cannot be the answer．
     Other people think the secret to those violins is the wood． It must be from certain kinds of trees．It must not be too young or too old． Perhaps the violin makers of Cremona knew something specialabout wood for violins．
     But the kind of wood may not be so important． It may be more important to cut the wood in aspecial way． Wood for a violin must be cut into the right size and shape． The smallest difference willchange the sund of the violin． Musicians sometimes think that this is the secret of the Italians．
     Size and shape may not be the answer either． Scientists make new violins that are exactly the  same size and shape． But the new ones still do not sound as good as the old ones． Some scientiststhink the secret may be the varnish (清漆)．It makes the wood look shiny, but it also helps the soundof the instrument． Since no one knows what the Italian violin makers used in their varnish, no one canmake the same varnish today．
There may never be other violins like the violins of Cremona． And there are not many of the old
     violins left． So these old violins from Cremona become more and more precious．
What would be the best title for the text?
A．The Secrets of Cremona Violins．
B．The History of Cremona Violins．
C．The Making of Italian Violins．
D．The Studies of Italian Violins．


5、 命题p：α=30°，命题q：sinα=1/2，则p是q的
A．充分但不必要条件
B．必要但不充分条件
C．充要条件
D．既不充分也不必要条件


6、
A．-15
B．15
C．-60
D．60


7、 若函数f(x)=1+log_ax在区间(0，+∞)内是减函数，则实数a的取值范围是
A．a>1
B．a>2
C．1D．0

8、 Well,we don't have any alcohol. So we just use petrol__________.
A．then
B．in change
C．instead of
D．instead


9、正六边形中，由任意三个顶点连线构成的三角形的个数为（　　）
A．6
B．20
C．120
D．720


简答题
10、假设你是李华，请用英语写一封信邀请Mike参加你和朋友在颐和园的周末野餐，并告诉他你将负责面包、水果和饮料。具体安排如下：

注意：词数应为100左右
Dear Mike，

                                                                                                                                       Yours,
                                                                                                                                       Li Hua

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