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问题 单项选择题 A1型题

患者女性，16岁。有周期性腹痛，无发热，超声检查发现 * * 扩张，气体线消失，内见-80min×40mm的椭圆形液暗区，有完整边界，内见密集细小光点，双侧卵巢未见异常。首先考虑为

A．盆腔脓肘

B．处女膜闭锁

C．卵巢囊肿

D．盆腔积液

E．巴氏腺囊肿

答案

参考答案：B

完形填空

首字母填空

Earth Hour started in Sydney o_小题1:_ March 31, 2007. M 小题2:  than two million homes and Businesses turned off their lights for an hour. A year 1 小题3:   , in 2008, Earth Hour became the world's activity and was supported by m小题4:of people from thirty-five countries. In 2009, over two thousand cities in the world took part in it, and Earth Hour came to China.  The purpose of the activity is to save energy and improve climate. Earth Hour has b_小题5:___ some new changes  to our lives.

We may have different ways to spend the hour. For e小题6:_____, we can go to school on foot or b 小题7:    bike, plant more trees, use water more than once, never l小题8:___ the lights on  when we are not at home. Try to make full use of paper by using b 小题9:  sides. Earth Hour is a call for us to work together for a bright f 小题10:  . It is also a message of hope and action.  Everyone can make a difference.  The improvement （改善）of our environment n 小题11:  everyone's efforts（努力）. Come on! J小题12:__ us in Earth Hour 2010!
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选择题

质量为m的汽车以恒定的功率P在平直的公路上行驶，汽车匀速行驶时的速率为v1，则当汽车的速率为v2(v2<v1)时，汽车的加速度为 (　　)

A．

B．

C．

D．
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