Lesson 95 Tickets, please. 请把车票拿出来。 Listen to the tape then answer this question. Why did George a ...

Lesson 61 Trouble with the Hubble哈勃望远镜的麻烦 1、哈勃望远镜The Hubble telescope被发射到太空was launched into sp ...

Lesson 5 No wrong numbers 　　无错号之虞 　　First listen and then answer the question. 　　听录音，然后回答以下问题。 　 ...