更多"How long is the main span of the Go"的相关试题:
[填空题]How long is the main span of the Golden Gate Bridge between the towers
[单项选择]Nobody yet knows how long and how seriously the shakiness in the financial system will the economy（）
A. knock down
B. drag down
C. settle down
D. put down
[单项选择]Nobody yet knows how long and how seriously the （）in the financial system will drag down the economy.
A. shallowness
B. shakiness
C. scantiness
D. stiffness
[单项选择]How long was Dilys lateHow long was Dilys late
A. Half an hour.
B. Twenty minutes.
C. One and a half hours.
[单项选择]How long will it take experts to agree how to measure obesity（ ）.
A. Half a year.
B. One year.
C. One and a half year.
D. Two years.
[单项选择]
How long is his vacation
A. (A) Two days.
B. (B) Eight days.
C. (C) Two weeks.
D. (D) Three weeks.
[单项选择]How long was Dilys late
A. Half an hour.
B. Twenty minutes.
C. One and a half hours.
[单项选择]How long has the magazine been on saleHow long has the magazine been on sale
A. for one year
B. for eighteen months
C. for two years
[单项选择]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 takes normal trees
A. will be a great benefit to lumber companies
B. make extra-good lumber for buildings
C. will probably be weak because of their fast growth
D. may be defenseless to many insects and diseases
