更多"Why are there problem weeds"的相关试题:
[单项选择]Why are there problem weeds
A. Because they are the weeds that cannot be eradicated by herbicides.
B. Because all selective herbicides can encourage the growth of previously unimportant weeds by eliminating their competitors.
C. Because they were hardly considered before so that their seeds were not prevented from germinating.
D. Because they benefit greatly from the fertilizer applied to the farm lan
[单项选择]If you can't solve this problem, why not try （） help
A. to ask for
B. to ask
C. asking for
D. asking
[单项选择]Why did the man have a problem
[单项选择]Why does the woman have a problem
A. She is taking too many classes.
B. She lives too lar from her family.
C. She made an error when she scheduled her trip.
D. She did not do well on her final exam.
[单项选择]Why might reverse culture shock be a problem
A. It hardly ever happens.
B. It is extremely stressful.
C. Most people do not expect it.
D. It only happens to young people.
[单项选择]Why is the problem of drinking and driving difficult to solve
A. An alcohol is easily obtained.
B. Drinking is linked to organized crime
C. Legal prohibition has already failed
D. Legislation alone is not sufficient
[单项选择]Why were cars considered the problem in colonial towns
A. Carts scared the pigs away.
B. Carts injured a large number of people.
C. Carts often moved too slowly.
D. Carts broke down too easily.
[单项选择]Why is the tsetse fly a problem in Africa
A. People do not like the sound it makes.
B. It eats food that people need.
C. It has killed many cattle herds.
D. It can destroy the crop there.
[单项选择]I wonder why he ______ to discuss the problem at the meeting.
A. declined
B. rejected
C. refused
D. delayed
