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[单项选择]One reason it is difficult to know why the whales are dying is that ______.
A. the whales travel such a long distance
B. there are more whales than there used to be
C. the whale bodies are too old to study by the time they are found
D. the whales are endangered
[单项选择]That job is quite difficult. I can understand why you have()so many problems.
A. run for
B. run over
C. run off
D. run into
[单项选择]Why is social behavior difficult to change
[单项选择]Why is transition so difficult
A. Because transition requires money and time.
B. Because many manufacturers are unwilling to change their equipment.
C. Because research on new materials is very difficult.
D. Because it takes 10 years.
[单项选择]Why does breathing become difficult for humans during a tornado
A. The wind becomes fast and hot.
B. Air pressure gets steadily lower.
C. The black area moves closer.
D. They are knocked to the ground.
[单项选择]Why is it difficult to combine television with Internet
A. Because the two media have different bandwidth.
B. Because the response times of Internet is long and erratic.
C. Because the two are operated on different principles of services.
D. Because the platforms are quite expensiv
[单项选择]Why is it difficult for young consumers to borrow money from bank
[单项选择]Why is it difficult to predict the possible effects of electromagnetic fields on an airplane' s computers
A. Because it is extremely dangerous to conduct such research on an airplane.
B. Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because research scientists have not been able to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.
[单项选择]Why is it difficult for Microsoft to retain employees
A. Because it faces an uncertain future.
B. Because it will have problem innovating itself.
C. Because it will have problem paying them.
D. Because it may be bought up by its competitors one day.