题目内容

According to the text, profit levels may fail to correspond to the volume of sales because（）

A. the full selling costs have not been taken into account.
B. the production costs were not estimated correctly.
C. there are unforeseen problems with distribution.
D. there has been a lack of economic stability.

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This interactive on-line program helps non-native writers of English improve or fine-tune (调整) their writing skills in English. Recommended for intermediate or advanced levels, this on-line language class targets common writing problems of ESL/EFL writers. Class participants will build more effective writing skills. Topics include the items listed below.● Clear explanations of grammar rules in English.● Examples of common errors.● Interactive practice activities that give students immediate feedback on answers.● Application activities to guide students in applying new skills.A free on-line needs assessment is provided to give participants an immediate results analysis to help them decide if this program will meet their needs.To register call (519) 594-5152.For further information, call (519) 594-5907 and ask for Dr. Roberts.Instructor: Kathy L. Hans, has been teaching in the field of English as a second language for more than 20 years. She has trained ESL teachers throughout California for the State Department of Education and authored Teaching Pronunciation in Context, a training text with videotapes for teachers.The Interactive On-line Program The participants of this program: (46) of EnglishThe aim of this on-line language class: to solve (47) of ESL/EFL writersThe number of program topics: (48) The way to decide if this program will meet the participants’ need: free (49) The length of Kathy L. Hans’s working experience, more than (50) Choose the right word to fill in the following essay corresponds to the air（）