Do I like to shop? Of course!  It's fun. Whenever I have free time, I go shopping. There is always something to buy—shoes, clothes, bags, books, etc.

                                                                      --Eileen

    I'm always shopping for my two daughters. Delia, my two-year-old daughter, often needs clothes or shoes. Jodie, my ten-year-old daughter, needs things for school. Do I ever shop for myself? Who has time? Is it fun? No way!

                                                                         Jane

    I don't care about clothes and luckily, I don't need to shop for my food. The only kind of thing I need to buy myself is about music.

                                                                         Nigel

    I like spending my flee time on something fun. To me, shopping is a necessity, not a pleasure (乐趣). I would like to dance, talk with my friends or play chess in my free time. I only shop when I have to.

                                                                         Louis

根据材料内容选择最佳答案。

我们吃的食物属于植物的哪部分：

甘薯——____、胡萝卜——____、芹菜——____、香蕉——____、花生——____

某校教学楼后面紧邻着一个山坡，坡上面是一块平地，如图所示，BC∥AD，BE⊥AD，斜坡AB长为26米，坡角∠BAD=68°．为了减缓坡面防止山体滑坡，保障安全，学校决定对该斜坡进行改造，经地质人员勘测，当坡角不超过50°时，可确保山体不滑坡．