step_by_step3000第三册unit1答案及原文(19)

Mission:

a. b. Grand finale:

Part III Returning to the Moon

Summary: Answers to the questions: 英语专业学生经典的听力材料

Unit 6 Science and Technology

Part I Warming up

A1.

1. This news item is about a kind of new bulletproof vest made of silk.

2. This news item is about research done by American and Japanese researchers to predict