根据下面资料，作答题。
【资料】A老师教学《大江保卫战》，安排学生浏览课文后在黑板上写下一句话：“大江保卫战是一场 的战争。”要求学生填上合适的词语，学生纷纷发言，填上了“凶险”“惊心动魄”“伟大”“气壮山河”等词语，教学进行的很顺利，A老师表扬了学生。
B老师听了A老师的课后，认真思考，调整了自己的教学设计，他是这样教的：先让学生读课文，让学生想想“你看到了什么，听到了什么”，然后把文字转化成一幅幅鲜活的图像，如汹涌的洪水、恶劣的环境、威武不屈的士兵、奋不顾身的连长……再通过提问引导学生交流。看到这样的场景，你有什么样的感受，你想说些什么，最后再引导学生进行填词练习。
关于B老师的教学，以下说法正确的有()查看材料
正确答案及解析
正确答案
解析
B老师在A老师之后对自己的教学设计进行了改进，教学设计包括教学目标，说明这次课有着明确的教学目标，A正确。在整个教学过程中，B教师有许多“留白”环节，充分调动学生积极性，说明其预设有一定弹性，BC正确。这样的引导—发现式的教学过程充分发挥了教学的有效性，使学生将所学的内容与之前的经验，以及实际生活联系起来，大大减轻了学生学习上的精神负担，故DE正确。此题全选。
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