更多"Why is the tsetse fly a problem in "的相关试题:
[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]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. asking for
C. to ask
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]The reason why people like to fly today is that ______.
A. it is interesting
B. it is cheaper than to go in any other way
C. it can cross the wide oceans
D. it takes less time
[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 is lead poisoning a new problem for condors
[单项选择]Why does the man say he will never fly with this airline again _____
A. Because of the bad service here.
B. Because it is very clouded here.
C. Because it is not safe with this airline.
D. Because there are always problems.
[单项选择]I wonder why he ______ to discuss the problem at the meeting.
A. declined
B. rejected
C. refused
D. delayed
[单项选择]History in South Africa is now taught differently because A. of the collapse of communism. B. of the collapse of rule by white people. C. teachers are better than before.
[单项选择]Our correspondent Carl from South Africa will give us a brief introduction of their presidential election.
A. reporter
B. representative
C. writer
D. interpreter
[单项选择]The woman biologist stayed in Africa studying wild animals for 13 years before she returned. Oh, dear! She______ a lot of difficulties!
A. may go through
B. might go through
C. ought to have gone through
D. must have gone through
[单项选择]Why is John studying
[单项选择]Why is music important
A. It can arouse excitement
B. It can help to slow down body rhythms
C. It can make people eager to study
D. It makes people used to the passive learning
