在广告调查中主要通过非正式方式进行调查的是()。
A. 探索性调查；
B. 因果性调查；
C. 描述性调查；
D. 结果性调查；
Choose the best answer from the four choices provided for each question.
A. The job makes them work very hard.
B. The job helps them live on their own.
C. Both have their physical limitations.
D. Both have to use their feet to do their job.
Choose the best answer from the four choices provided for each question.
A. They always think about how to get the work done.
B. They always worry if they can complete their work.
C. They depend on friends’ help and encouragement.
D. They depend on each other to overcome their limitations.
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