补全短文

In the past, people climbed mountains to hunt, or to find grassland for their animals.【B1】.

There are three basic types of climbing: alpine (高山) climbing, ice climbing, and rock climbing.【B2】However, rock climbing only requires a rock face or clif, even ifit is indoors!

There are two kinds of rock climbing. One is free climbing. People use only their hands and feet to climb up a cliff or rock wall. The other type is aid climbing.【B3】 For example, they use ropes to help pull themselves up.

【B4】One kind of competition is about speed. Two similar walls are set up next to each other, and the climbers race to the top. The other kind of competition is about decision- making. Each climber is given the same amount of time to climb the same wall, and whoever gets to the highest point wins.【B5】.

A. Very few people like ice climbing.

B. New climbers spend more money on climbing.

C. There are different rock climbing competitions.

D. In aid climbing, people can use many different tools.

E. Alpine climbing and ice climbing are done on mountains.

F. The climbers must decide which path is the best to get to the top.

G. Today, people often climb mountains for fun and even competition.