1.The three main geographic regions of Peru are the

A. sierra, the rain forest, and the plateau
B. pampas, the rain forest, and the montaña
C. selva, the sierra, and the pampas
D. sierra, the coastal plain, and the selva
2.When oil prices fell in the mid-1980s, Venezuela's economy
A. suffered a decline
B. enjoyed an increase
C. stayed about the same
D. began to show signs of recovery
3.Most of Venezuela's population lives
A. in cities
B. in the countryside
C. on islands of floating reeds
D. in islands of floating reeds

I'll be glad to check your answers.

3A 2D 1B

3 A is correct. The other two are wrong.

2A 1D?

Yes. Those are right.

1 is not Harbors(D). It is obviously B: oxygen.

All the trees there would produce oxygen, not harbors.

Oops, wrong lesson, sorry. Those are the correct answers, don't listen to my first post because it was wrong. Sorry again.