在探究“骨的成分与骨的特性之间的关系”的实验中，进行了如下操作，据图回答下列问题。

4÷ $\frac{\text{7}}{\text{20}}$ × $\frac{7}{10}$ =____

B) 根据语境，从方框中选择恰当的单词填空，并将正确答案填在短文后的横线上。

    To improve your English reading, you should, first of all, choose something you feel important or____ to read. Don't try to read everything. You should____ those written in easy English. Don't read those which is difficult for you at the very beginning.

    While reading, don't read too slowly or look up every new word you meet with. After reading a passage and having its main idea in mind, you may____ and read it again. This time you can read it slowly and look up some new words ____ necessary.

    Keep on reading in this way and you'll surely make____ little by little.