14-20

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14-2014-20 14-2014、B15、B16、Whatareusedfor17、Whatdothinkis18、Whenwasinvented19、didn''tuntil20、was

14-20
14-20

14-20
14、B
15、B
16、What are used for
17、What do think is
18、When was invented
19、didn't until
20、was broken by

14 .D 15. B
16 What are they used for
17. what do you think is the most helpful invention
18 .When was the zipper invented
19.He didn't go to bed until he finished his work
20.The glass was broken by a boy

14-20 14,20,54,76,( ) 第14~20 -20+(-14)-(-18)-13 14到20题 14到20题英语题14-20 14到20题 14-20题 |-14|+|-16|+|+20| 13 14 20 21 -20+(-14)×(-8)÷(-2) 14、20题谢谢大家! 14到20题答案 14至20题答案求14-20题答案 14～20题几何图形六年级 13、14、20题求解