It takes a long time to grow a tree. How long Well, pine trees are the quickest growing trees, but still, they take twenty years to reach a size suitable for cutting and harvesting. An oak takes about sixty years to grow to a good size. A redwood may take hundreds of years.
Lumber companies, which make their money on trees, depend on those that grow quickly. There- fore, they are always looking for methods to make trees grow faster. So far, the secret to fast growing trees seems to lie in "super-seeds." These are seeds that are gathered from the quickest growing trees in a forest. One company searched 100,000 acres of trees and selected the seeds from just fifteen trees. These two ounces of seed were enough to plant several hundred new trees. Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop. This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it
A. planting many trees and fertilizing them
B. collecting seeds from strong, slow growing trees
C. selecting the seeds of the fastest growing trees
D. feeding them high-energy plant foods
It takes a long time to grow a tree. How long Well, pine trees are the quickest growing trees, but still, they take twenty years to reach a size suitable for cutting and harvesting. An oak takes about sixty years to grow to a good size. A redwood may take hundreds of years.
Lumber companies, which make their money on trees, depend on those that grow quickly. There- fore, they are always looking for methods to make trees grow faster. So far, the secret to fast growing trees seems to lie in "super-seeds." These are seeds that are gathered from the quickest growing trees in a forest. One company searched 100,000 acres of trees and selected the seeds from just fifteen trees. These two ounces of seed were enough to plant several hundred new trees. Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop. This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it
A. the life span of trees
B. the age of redwoods
C. making trees grow quickly
D. cutting trees for lumber
Making a film takes a long time and is very hard work. Writing for the film may take many weeks. Filming the story being acted—or shooting the film, as it is called—often takes at least six months. Actors and camera-men work from very early in the morning until late at night. Each scene has to be acted and re-acted, filmed and re-filmed, until it is just right. Sometimes the same scene may have to be acted twenty or thirty times.
The film studio is like a large factory, and the indoor stages are very big indeed. Scenery of all kinds is made in the studio: churches, houses, castles, and factories are all built of wood and cardboard. Several hundred people work together to make one film. Some of these people are the actors and actresses. The director of the film, however, is the most important person in a film studio. He decides how the scenes should be filmed and how the actors should act.
Most people go to see a film because they know the film-stars in
A. wood and cardboard
B. indoor stages
C. houses
D. films
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