在A点以B点为已知方向用极坐标法测设P点，已知αBA=210°18′，αAP=208

A物体做匀速直线运动，速度是1m/s．A出发后5s，B物体从同一地点由静止开始出发做匀加速直线运动，加速度是0.4m/s²，且A、B运动方向相同，求：

（1）B出发几秒后能追上A？

（2）A、B相遇前它们之间的最大距离是多少？

国家环境质量标准的制定和气候异常问题成为近期人们热议的话题。针对全球变暖趋势的论调,专家指出,去年入冬以来世界各地频发的极寒天气,是地球变暖过程中的正常现象,气候变暖的长期趋势没有本质变化,这一判断是从一个较长时间尺度上得出的。这告诉我们作出正确判断要(　　)

①透过现象把握事物的本质联系　

②根据客观情况的变化及时修订认识　

③尊重专家权威得出的现成结论　

④不断接受变化发展的实践的检验

A．①②

B．②③

C．①④　

D．③④

引起大气运动的根本原因是：（   ）

A．空气的上升或下沉

B．地转偏向力

C．气压差异

D．地区间的冷热不均

A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hyperlinks-there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

（73）处填（）。

A．direct

B．navigate

C．indicate

D．go-on

下面属于声音编辑软件的是（）

A.WindowsMovieMaker

B.WinAVI

C.Maya

D.Cooledit