上級者が英語力（特に読解力）をつけたければ、語彙を増やすのが王道ですね。
If the more advanced want to improve English ability (especially reading comprehension) increasing vocabulary is the way to go.
Sentences
Example Sentences for 級
Kanji 級, meaning class, appears in 67 Japanese example sentences with translation.
This page groups example sentences to show how kanji 級 appears in context, how the reading behaves, and how the translation maps to the usage.
Showing 61-67 of 67
Page 5 of 5
日本語能力試験は５つの級に分かれる。５級が一番易しくて、１級が一番難しい。
The Japanese Language Proficiency Test is divided into five levels, with Level 5 being the easiest and Level 1 being the most difficult.
カール・マルクス曰く「あらゆる社会の歴史は階級闘争の歴史である」だそうです。
Karl Marx says, "The history of all hitherto existing societies is the history of class struggles."
例えば、私は、来年進学する大学の単位が実際にもらえる数学の上級クラスにいます。
For example, I am in a high-level math class that actually gives me college credits for next year.
気象庁は、東日本大震災のマグニチュードを８．８から、世界観測史上最大級のＭ９．０に修正した。
The Japan Meteorological Agency has revised the magnitude of the eastern Japan quake from 8.8 to 9.0, the largest recorded in world history.
日本の問題点は、国内での階級的な個人同士の関係の延長として国際関係をとらえてきたことである。
Japan's problem has been that she has continued to view international relations as an extension of her hierarchical interpersonal relations at home.
友達からチョコもらっちゃった。とても高級そうだし美味しそうなんだけど。これって、コーヒーと一緒がいい？それともワイン？
I was given some chocolates by a friend, they look very classy and appetising, but do you think they would go well with coffee? Or wine?