某工厂有甲、乙、丙三类产品的数量成等比数列且公比为2，现要用分层抽样的方法从中抽

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小题1:Paris is the capital and largest city of France,________ (坐落在)on the River Seine.

小题2:Fires caused by the California Earthquake did the most___________(损失).

小题3:F__________(幸运地), we put all the fires out quite quickly.

小题4:Confucius is the philosopher whose_______(影响) is the greatest.

小题5:Mencius was a thinker whose teachings were very________ (类似；相似) to those of Confucius.

小题6:Our teacher often stresses the___________ (重要性) of studying English.

小题7:You are___________(绝对地；完全地) right.

小题8:The earthquake in 1956 a________(影响) eight provinces.

小题9:The_________(以前的) owner of the flat is an old man.

小题10:Many people were made____________(无家可归的) after the earthquake.

小题11:The flood hit the city yesterday , __________(造成) three deaths.

小题12:We must protect____________(环境).

小题13:We________ (经历) a lot of difficulty in selling our house the other day.

小题14:s.

小题15:This river is one of the most p_______ (受到污染的) areas in that region.

如图所示，L₁为入射光线，L₂为出射光线．请在图中添加合理的光学器件o（注意所添加的器件位置要正确）．

下列化学反应与实验现象相符合的是（  ）

A．硫在空气中燃烧——蓝紫色火焰

B．木炭在空气中燃烧——生成有刺激性气味的气体

C．镁在氧气中燃烧——生成白色固体

D．红磷在空气中燃烧——冒白雾

属分析性研究方法的是（）。

A.现况调查及病例对照研究

B.现况调查及队列研究

C.现况调查及试验研究

D.病例对照研究及队列研究

E.队列研究及试验研究

在Windows中，如果要将当前窗口存入剪贴板中，可以按( )。

A．Alt+Printscreen键

B．Ctrl+Printscreen键

C．Printscreen键

D．Shift+Printscreen键