After careful research, it was decided that the spaceship should reenter the Earth’s________.

A. surface   B. air    C. environment  D. atmosphere

After careful research, it was decided that the spaceship should reenter the Earth’s________.

A. surface                     B. air                           C. environment             D. atmosphere

After careful research, it was decided that the spaceship should reenter the Earth’s________.

A. surface　　　 B. air　　　　　 C. environment　　　 D. atmosphere

After careful research, it was decided that the spaceship should reenter the Earth’s________.

1. A.
   surface
2. B.
   air
3. C.
   environment
4. D.
   atmosphere