题目

假设你是红星中学高三学生李华。请根据以下四幅图的先后顺序,为校刊“英语园地”写一篇短文,讲述你在这个寒假居家自主学习的过程。注意:词数不少于 60。 答案:I spent an unforgettable winter vacation this year, during which I becamean autonomous learner. At the beginning of the vacation,I made a detailed learning plan. I first listedthe learning tasks for the following days and then made plans in great details to ensure that they are practicaland feasible. Then I startedlearning as scheduled. With the learning materials piled on my desk, I was alwaysin19.在三棱锥P-ABC中,D为底面ABC的边AB上一点,M为底面ABC内一点,且满足$\overrightarrow{AD}=\frac{3}{4}\overrightarrow{AB}$,$\overrightarrow{AM}=\overrightarrow{AD}+\frac{3}{5}\overrightarrow{BC}$,则三棱锥P-AMD与三棱锥P-ABC的体积比 $\frac{{{V_{P-AMD}}}}{{{V_{P-ABC}}}}$为(  )A.$\frac{9}{25}$B.$\frac{4}{5}$C.$\frac{9}{16}$D.$\frac{9}{20}$
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