我市望城县丁字湾盛产麻石,小明在麻石加工厂看到一块标明密度为2.5×lO3kg/m3的正方体样品,他用刻度尺测得其边长 (如图所示)为 cm,则其质量为 kg.
图2-12
①深入实施“一带一路”战略
②筹建和成立亚洲基础建设投资银行
③加快经济特区建设
④推进人民币国际化进程。
Ⅰ.青蛙发育过程的顺序是:D→。青蛙的生殖和发育在水中进行,青蛙进行(填“体内”或“体外”)受精。
Ⅱ.蝌蚪的形态和结构与成蛙的区别很大,青蛙的发育方式为发育。
①有性生殖和无性生殖的根本区别是:有无两性生殖细胞的结合。家蚕的生殖属于生殖。
②从图中看出,家蚕的发育是发育。因为家蚕的发育过程经历了受精卵、、蛹和成虫四个时期。
甲 | 8 | 9 | 7 | 9 | 8 | 6 | 7 | 8 | 10 | 8 |
乙 | 6 | 7 | 9 | 7 | 9 | 10 | 8 | 7 | 7 | 10 |
且 =8,S乙2=1.8,S甲2=1.2,根据上述信息完成下列问题:
Fifty-three years ago Barbie Millicent Roberts first appeared in the world of toys. Since then, Barbie doll, as everyone called her, has become the most successful toy doll in history. Her parent, the Mattel Company, said that 90% of all American girls between 3 and 10 have at least one Barbie at home.
However, Barbie is facing some trouble at present(现在). There are many similar dolls on the market in competition with her. Another doll named Bratz, for example, came to life thirteen years ago. She looks more like today's pop stars with heavy makeup(浓妆) and miniskirts. And her company offers more kinds of clothes too.
It seems that Barbie has lost her magic among older girls. “For younger girls, playing with a Barbie is much fun. But when you get older, you want something smarter and more modern,” says Vera Shepherd, a shop assistant in a New York toy store.
It is good news that on the international market, Barbie is still No.1. Although Mattel is selling fewer Barbies in the United States these years, sales in other countries are still going up. In January 2009, Mattel opened its first Barbie store in Shanghai, where girls can shop, eat, drink or even become fashion designers for their own Barbies.
Mattel is planning big celebrations for Barbie's 53rd birthday. Fashion designers from all over the world have been called to make new dresses for Barbie. How long will Barbie stay popular in the world of toy dolls? It is hard to say, but 53 is surely not the age to retire(退休).