单项选择题
1、 已知向量a=(2，-4)，b=(1，2)，c=(1，-2)，d=(-2，-4)，则其中共线的有（　　）
A．a与d共线，b与c共线
B．a与b共线，c与d共线
C．a与c共线，b与d共线
D．以上答案都不正确


2、 函数y=log5x(x>0)的反函数为（　　）
A．y=x5(x∈R)
B．y=5x(x∈ R)
C．y=5x(x∈R)
D．y=1/5x(x∈R)


3、 下列有关次世界大战的评价，不正确的是（　　）
A．是两大帝国主义集团重新瓜分世界、争夺势力范围和霸权的斗争
B．战争规模不断扩大，战火波及亚、非、欧、美四洲
C．为俄国进行社会主义革命创造了条件
D．使国际关系出现了新的格局


4、 If only she __________ her necklace that night.
A．didn't lose
B．wouldn't lose
C．hadn't lost
D．hasn't lost


5、 __________ as he is,he is not proud.
A．Success
B．Successful
C．Successfully
D．Succeed


6、 阅读下列短文，回答题。
Little Tom down the street calls our dog，“The keep dog”．Zip is a sheep dog．But when Tom tries to say“Sheep”．it xo mes out“keep”．And in a way Tom is right．Zip is always bringing things home for us to keep!I'll tell you about 80lne of them．
Zip’s first present was a shoe．It Was made of green silk．
We didn’t know how Zip found the shoe．But after a moment Mary，my big sister，told me the shoe had a strange smell．I nodded(点头)and held my nose．“What do you think it is?”
“It smells like something for cleaning．I think someone tried to clean a spot(污点)off the shoe．
Then he put it at the door to dry．”
“Along came Zip．And good-bye shoe!”I said．“We should take it back．”
“We can’t”，said my sister．
“Maybe little Tom is right．”Mary said．“Maybe Zip is a keep dog!”
The writer and Mary didn’t know__________.
A．what Zip’s first present was
B．how Zip carried its first present home
C．who owned Zip’s first present
D．what Zip’s first present was made of


7、 I think they __________ have finished the design by now as a month has already passed.
A．should
B．shouldn't
C．could
D．can


填空题
8、
 
 


9、 为了考察某种小麦的长势，从中抽取10株苗，测得苗高如下(单位：cm)：
12，13，14，15，10，16，13，11，15，11．
则该品种的小麦苗高的样本方差为__________cm²．

10、

责编：cll  评论 纠错