能否穿越无边暗？

　　小气球，脱绳系，

　　飞越农舍真高兴，

　　阳光给予它温暖，

　　永远高飞不费力；

　　别紧张，小气球

　　别笑麻雀伤口留，

　　光光的树梢歇片刻，

　　恒(钻石)心终把成功求。

　　加餐练(一)　完形阅读组合练

　　Ⅰ.完形填空

　　Seven days is not natural because no natural phenomenon occurs every seven days. The year 1 one revolution (旋转) of the earth around the sun. Months, supposedly, indicate the 2 between full moons. The seven­day week, 3 ， is completely man­made.

　　It is believed that the seven­day week was 4 by Babylonians 4,000 years ago. They 5 there were seven planets in the solar system, and the 6 held such power to them that they planned their 7 around it. Their seven­day week spread to Egypt, Greece, and eventually to Rome and it was firmly established in the western 8 about 250 years before Christ was born.

　　Some 19th­century Britons used the week's seventh day for 9 rather than for the rest prescribed (规定) by the Bible. They would drink and 10 themselves so much that the phenomenon of "Saint Monday，" in which workers would 11 rather than go to work in order to recover from Sunday's gallivanting (闲逛), appeared. English factory owners later 12 with workers by giving them a half­day on Saturday in exchange for 13 attendance at work on Monday.

　　It took decades for 14 to change from a half­day to a full day rest. In 1908, a New England factory became the first American factory to 15 the five­day week. It did so 16 Jewish workers don't work on Saturday for religious reasons. The factory gave these 17 a two­day weekend, and other factories followed this 18 . The Great Depression (1929－1939) strengthened the two­day weekend, as 19 hours were considered a solution to underemployment. Since then, the five­day workweek has become the 20 organizing concept behind when work is done.

1．A.explains　　　　　　　 B．marks