发展性研究
参考答案：
主要目的在于发展用于教育进步和学校运行的有效策略，回答的问题是“如何改进”。
—Can I help you with it?
—I appreciate your , but I can manage it myself.
A．offer
B．advice
C．question
D．idea
Alice, bent ______ losing weight, increased the time of exercise to three hours______ a time.[ ]
A. on; in
B. on; for
C. with; for
D. with; at
