我国的经济发展迅速，随着城市化进程不断加快，城市的绿化问题也逐渐成为人们关注的焦点．一些小区的绿化不仅构思新颖，造型美观，而且对植物种类的搭配也恰到好处，一年四季都可以看到绿色的植物，使人的心情自然愉悦．请根据所学的知识回答下列问题：

中国古代家训灌输忠孝观念，强调治家理财，重视耕读立业。到了近代，则强调经世致用，重视培养工商业意识，注重培养世界视野。这种变化出现的主要原因是（    ）

（1）Swallows fly back to the ____ part of the country in winter every year.(南方)
（2）The space sleeping bag is fixed to the walls to prevent ____ .（飘浮）
（3）I am not sure whether the watches are those ____ .(绅士）
（4）You will get much____ if you give up eating fast food.(苗条)
（5）It is said that this kind of the car is____ designed for her.(特别的)
（6）In winter you’d better keep____  warm enough to stay healthy.(you)
（7）We____  could not believe our ears when we heard the surprising news.(simple)
（8）The water in the river is ____ . You can drink it without cooking.(harm)
（9）Works of MoYan is very popular among Chinese____  .(read)
（10）My daughter hopes to go abroad for ____ (far) study next year.

如右图所示电路，开关S闭合后，电压表V₁的示数为3.8V，V₂的示数为6V。则灯L₁两端电压和电源电压分别是（    ）