英语单选_集考试卷模拟考试题_114

1、姓名：_ 班级：_ 学号：_-密-封 -线- 英语单选_集考试卷模拟考试题考试时间：120分钟 考试总分：100分题号一二三四五总分分数遵守考场纪律，维护知识尊严，杜绝违纪行为，确保考试结果公正。1、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

2、 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-

3、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 w

4、ill 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 takes normal trees to develop.unfortunately, it takes a long time for a plan like this to reach its goal. the weyerhauser lu

5、mber corporation, which started its first collection of seed in 1958, is just now beginning to harvest the super-seeds of the first generation of the faster growing trees.this selection centers on_. （ ）a.the life span of treesb.the age of redwoodsc.making trees grow quicklyd.cutting trees for lumber

6、2、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

7、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

8、 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 selecti

9、on will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop.unfortunately, it takes a long time for a plan like this to reach its goal. the weyerhauser lumber corporation, which started its first collection of seed in 1958, is just now beginning to har

10、vest the super-seeds of the first generation of the faster growing trees.trees that grow faster are developed by _. （ ）a.planting many trees and fertilizing themb.collecting seeds from strong, slow growing treesc.selecting the seeds of the fastest growing treesd.feeding them high-energy plant foods3

11、、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 m

12、ake 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

13、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 selectio

14、n will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop.unfortunately, it takes a long time for a plan like this to reach its goal. the weyerhauser lumber corporation, which started its first collection of seed in 1958, is just now beginning to harv

15、est the super-seeds of the first generation of the faster growing trees.super-trees _. （ ）a.will be a great benefit to lumber companiesb.make extra-good lumber for buildingsc.will probably be weak because of their fast growthd.may be defenseless to many insects and diseases4、it takes a long time to

16、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,

17、 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

18、 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 takes normal trees to develop.unfortunately, it takes a long time for a plan like this to reach its goal. the weyerhauser lumber corporation, which started its firs