step_by_step3000第三册unit1答案及原文(18)

Part II News reports

A

Summary :

… Answers to questions:

1. 2. 3. 4. B

Event : NASA’

First installment:

Names of spacecrafts: the Mars Global Surveyor Orbiter / the Pathfinder Lander

Second installment:

Names of spacecrafts: the Polar Lander / the Mars Climate Orbiter

Launch time: