小题1:in london
小题1:it was used for changing the weighe of the balioon
小题1:the work of throwing some more sand was slow and they were sull falling
小题1:1,797 kilometres
小题1:they were very brave and clever,and the trip was dangerous but exciting
小题:从第一段的句子：They started early in London.可知答案是in london
小题1:从第二段的句子：So they were able to use the box to change the weight of the balloon.可知答案是it was used for changing the weighe of the balioon
小题1:从第三段的句子：The work was slow and they were still falling, so they had to drop some whole bags of sand.可知答案是the work of throwing some more sand was slow and they were sull falling
小题1:从第四段的句子：They had travelled 1,797 kilometres from London!
可知答案是1,797 kilometres
小题1:从文章的内容可以归纳出，这些人很勇敢，很聪明，这次旅行危险又刺激，可知答案是they were very brave and clever,and the trip was dangerous but exciting