16、Does earth look any different from it used to be? 我们的地球看起来和以前有什么不同? 17、What is the longest distance between the ISS and the earth? 空间站和地球的最远距离是多远? 18、Which time zone do you use in the space?
12. a )moveable metal type began to be used in printing b) chinese printing technology was first introduce c)the earliest known book was published d) metal type was imported from korea 13. a) it had more than a hundred printing presses...
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