位于我国地势的第二、三级阶梯分界线上，呈东北—西南走向，又是华北平原和黄土高原分界线的山脉是（   ）

下列说法 正确的是（   ）

    When I was in the middle school, I was good at many subjects ____ (除了) English. It was a little difficult for me and I often made ____ (错误) in the test. I felt very sad.

    Luckily, my English teacher Miss Li was ____（相当地）kind. She advised me to buy a dictionary and ____(提议，提出) to help me solve ____ (主要的，基础的) problems. Miss Li said that I ____(应该) speak English aloud and read ____(大量，众多) of English books. With her help, my English improved ____(迅速地,快地). It was much ____ (更简单) for me to remember the words than before. And I became one of the actresses in the school English show at ____(终于，最后).

    I was thankful to my dear English teacher, Miss Li.