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信息发布者:
increase
impossible
without
time
cause
Zhang Li as the chairperson of the Students' Union.
        Zhang Li studies very hard and she has gone far beyond all her classmates in study. She is very 
modest and never shows off before others. She is also creative. She often comes up with good ideas. 
She is so helpful that she always helps the classmates with their schoolwork. Last week, I failed the 
Maths exam and felt very sad. She advised me to achieve a balance between schoolwork and rest and 
encouraged me not to give up easily.
        I think Zhang Li has all the qualities to be the chairperson and she will be a good leader.
beyond 超出(范围)
lead to 导致
at least 至少
make up for 弥补、补偿
storage 储存,贮藏
stay awake  保持清醒
compared ... to ... 与……相比较
1.increase
句意:每天睡眠不足6小时会增加健康问题的风险。
根据第二段第1-2行:When we sleep below six hours a day, we are at an increased risk of health problems.(当我们每天睡不到6小时,我们的健康问题风险就会增加。)可知此题考查词形转换。inereased是形容词,意为“增强的”,其动词形式为 increase。根据题干中的can可知,情态动词后接动词原形。故填increase。

2.impossible
句意:工作日失去的睡眠时间是不可能弥补的。
根据文中第二段第2-4行:Some of us think we can make up any of those hours lost during the workweek on the weekends. Sadly, there is no storage system for sleep in the brain.(我们中的一些人认为我们可以在周末弥补一周中所损失的睡眠时间。不幸的是,大脑中没有睡眠储存系统。)可推知空格处填形容词表示“不可能的”,impossible“不可能的”,故答案为impossible。

3.without
句意:没有足够睡眠的人会坚持说他们很好,但根本做得不好。
根据第四段第一句:When you are reading this, you might say you usually get six hours of sleep and feel just fine.当你在读这篇文章时,你可能会说你通常睡六个小时,感觉很好。也就是没有充足睡眠的人会说他们感觉很好。这里填without表示“没有”。

4.time
句意:在适当的时间喝适量的咖啡。
根据最后一段:Coffee can keep us awake. Remember, too much coffee may throw off our sleep and energy cycles. So limit coffee and avoid caffeine for four to sixhours before bedtime.(咖啡能让我们保持清醒。记住,喝太多咖啡会影响我们的睡眠和能量循环。因此,在睡前的四到六个小时内,不要摄入咖啡和咖啡因。)可推知,空格处表示“时间”,at proper time “在合适的时间”,故答案为time。

5.cause
句意:睡眠不足会影响我们的健康,并导致许多错误。
根据第一段第一句:not getting enough sleep can lead to car accidents or other mistakes(睡眠不足还会导致车祸或其他错误)可知,此题考查 lead to “导致”的同义词,相当于 cause。
Dear all,
       I'd like to(想做某事) recommend Zhang Li as(推荐……作为……) the chairperson of the Students' Union. 
        Zhang Li studies very hard and she has gone far beyond(远远超过) all her classmates in study.  She is very modest and never shows off(从不炫耀) before others. She is also creative.  She often comes up with(想出) good ideas. She is so helpful that(如此……以至于……) she always helps the classmates with their schoolwork. Last week, I failed the Maths exam and felt very sad. She advised me to(建议某人做某事) achieve a balance(达到平衡) between schoolwork and rest and encouraged me not to(鼓励我不要做某事) give up easily(轻易放弃)
      I think Zhang Li has all the qualities to be the chairperson and she will be a good leader.
                                                     Yours sincerely
                                                        Wang Hua
正文第一段介绍了Zhang Li的优点以及举出了具体的例子;
第二段总结全文。
范文中包含了提示中所有的要点,文章内容完整充实、逻辑清晰、表达地道,句式多变,长短句结合,文章很有可读性。