Lesson 68 Persistent 纠缠不休

06-14

Lesson 67 Volcanoes 火山

06-13

Lesson 66 Sweet as honey! 像蜜一样甜!

06-06

Lesson 65 Jumbo versus the police 小象对警察

06-06

Lesson 64 The Channel Tunnel 英吉利海峡隧道

06-06

Lesson 63 She was not amused 她并不觉得可笑

05-05

Lesson 62 After the fire 火灾后

05-05

Lesson 61 Trouble with the Hubble 哈勃望远镜的困境

04-05

Lesson 18 He often does this! 他经常干这种事

03-28

Lesson 60 The future 卜算未来

03-27