2011年6月英语四级作文真题:网上购物

文章词汇表达要更加熟练，希望能更多使用一些学术词汇；过渡词很丰富，衔接词同时使用的恰到好处；有效的运用了一些复杂句；请注意分段。

Thirdly, enough sleep benefits our mind. According to researcher from American and French, the “Sharp Wave Ripple” in brain which is responsible for strengthen memory can only appear when people fall into deep sleep. If we have enough sleep, then our memory will be improved so that we can learn things more efficiently.