题型:填空题 地球上生物的出现,是多种因素共同作用下的结果,下列说法中不正确的是:A.地球处在一个比较稳定和安全的宇宙环境中B.日地距离适中、地球的体积和质量适中C.地球的自转速度适中D.地表的地形、土壤条件适中 查看答案
题型:填空题 书面表达。 根据下面的表格,用英语写一篇短文,标题已给出。(80词左右) How was the ball-point pen invented?who John Loud, an American tannerwhenin1888advantagehelp write faster , make life easierdisadvantageneed refilling, sometimes leakto be usedmany fieldspricelowchangesbecome small and lighterNotes:ball-point pen圆珠笔;tanner制革工人;refill再充填;leak漏 How was the ball-point pen invented?_______________________________________________________________________________________________________________________________________________________________ 查看答案