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【单选题】
附睾的作用是什么?A.
分泌雄激素
B.
形成精子
C.
使精子成熟并具有运动功能
D.
只是一个通道
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举一反三
【简答题】OECD
【简答题】已知两个椭圆的方程分别是 C 1 ：x 2 +9y 2 -45=0， C 2 ：x 2 +9y 2 -6x-27=0、 （1）求这两个椭圆的中心、焦点的坐标； （2）求经过这两个椭圆的交点且与直线x-2y+11=0相切的圆的方程．
【单选题】According to the professor, when were non-Eropean countrie admitted to The OECD?
A.
During the Second World War
B.
At the end of the Second World War
C.
in 1961
D.
About 20 years ago.
【判断题】Turkey joined the EU in 2008 after implementing the necessary political and economic policy changes.
A.
正确
B.
错误
【单选题】A study published in 2011 by the OECD noted that:
A.
the real household income of the unskilled workers in the U.S. increased more in comparison to that of the skilled workers.
B.
in almost all countries real income levels declined over the 20-year period studied.
C.
falling unemployment rates brought gains to low-wage workers and fairly broad-based wage growth.
D.
the gap between the poorest and richest segments of society in some OECD countries had widened.
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