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【单选题】
下列哪种白细胞在患寄生虫病时明显增加A.
嗜酸性粒细胞
B.
嗜碱性粒细胞
C.
中性粒细胞
D.
淋巴细胞
E.
单核细胞
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【单选题】—Why did you all go roller skating _________ Tony? —Because he preferred to watch the World Cup at home. [ ]
A.
with
B.
without
C.
besides
【单选题】Why did many American scholars become enthusiastic about humanistic studies after World War II?
A.
They wanted to improve their own status within the current education system.
B.
They believed the stability of a society depended heavily on humanistic studies.
C.
They could get financial support from various foundations for humanistic studies.
D.
They realized science and technology alone were no guarantee for a better world.
【单选题】Why did many southerners go to the Northeast and the Midwest during World War Ⅱ?
A.
Because they wanted to learn to like country music.
B.
Because they wanted to take music with them.
C.
Because country music was popular all over the country.
D.
Because they wanted to work in the factories there.
【单选题】The word pen originally meant 'feather used for writing with ink'. Now it refers to any devise used for writing with ink. This is an example of
A.
degradation of meaning.
B.
broadening of meaning.
C.
narrowing of meaning.
D.
elevation of meaning.
【单选题】Why did many southerners go to the Northeast and the Midwest during World, War Ⅱ?
A.
They wanted to learn to like country music.
B.
They wanted to take music with them.
C.
Country music was popular all over the country.
D.
They wanted to work in the factories there.
【简答题】在平面直角坐标系内有两个定点F 1 ，F 2 和动点P，F 1 ，F 2 坐标分别为F 1 （-1，0）、F 2 （1，0），动点P满足 | PF 1 | | PF 2 | = 2 2 ，动点P的轨迹为曲线C，曲线C关于直线y=x的对称曲线为曲线C″，直线y=x+m-3与曲线C″交于A、B两点，O是坐标原点，△ABO的面积为 7 ， （1）求曲线C的方程； （2）求m的值．
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