①要遵守道德

②要遵守法律

③促进经济的发展

④做一名负责的网络参与者

    The Winter Olympics is also called the White Olympics．At this time，many colorful stamps are published to mark the great Games．The first stamps marking the opening came out on January 25th，1932 in the United States for the 3rd White Olympics. From then on，publishing stamps during the White Olympics became a rule.
    During the 4th Winter Olympic Games a group of stamps were published in Germany in November l936. The five Olympics rings were drawn on the front of the sportswear．It was the first time that the rings appeared on the stamps of the White Olympics．
    In the 1950s，the stamps of this kind became more colorful．When the White Olympics came，the host countries(主办国) as well as the non-host countries published stamps to mark those Games．China also published four stamps in February 1980 when the Chinese sportsmen began to take part in the White Olympics．
    Japan is the only Asian country that has ever held the White Olympics．Altogether 14,500 million stamps were sold to raise money for this sports meeting．
    Different kinds of sports were drawn on these small stamps．People can enjoy the beauty of the wonderful movements of some sportsmen.

用两平行面去截球，如图，在两个截面圆上有两个点，它们的球坐标分别为  $A(8,\frac{\mathrm{\pi }}{4},{\theta }_a),B(8,\frac{3\mathrm{\pi }}{4},{\theta }_B)$， 求出这两个截面间的距离

《东京梦华录》记载：茶坊每五更点灯，买卖衣服图画花环之类，至晓即散，谓之“鬼市子”。……大抵诸酒肆瓦市，不以风雨寒暑，白昼通夜。此生活景象反映的是（   ）

____ 是进化论的建立者．他认为，人类和现代类人猿的共同祖先是森林古猿；下到地面生活的森林古猿，由于____的改变和自身的变化，一代一代地向着____ 的方向发展，____肢解放出来，臂和手逐渐变得灵巧，能使用和制造____．