Do you have trouble getting started in the morning? Do you have problems learnin

题文

Do you have trouble getting started in the morning? Do you have problems learning early in the day? If you do, you are not alone, _小题1:__ They learn better at night than they do in the morning.To investigate when cockroaches(蟑螂) learn best, rearchers at Vanderbill University tested the incts for which odor(peppermint 薄荷 or vanilla 香草) they preferred. Most cockroaches preferred the smell of vanilla to that of peppermint at all times. __小题2:__ Therefore, the scientists trained the cockroaches to prefer the peppermint smell by rewarding the incts with a taste of sugar water when they approached a peppermint smell. _小题3:__When the cockroaches were trained at night, they remembered the new associations(peppermint＝sugar water; vanilla＝salt water) for up to 48 hours. However, if the cockroaches were trained in the morning, they quickly forgot which smell went with which water. __小题4:_So, cockroaches learn better at night than they do in the morning. _小题5:_ Becau of this, it is likely that information they gather at night will be more uful to them. The experiments provide some clues about the interactions between body rhythms, learning and memory.A．When the incts moved toward a vanilla smell, on the other hand, they were punished with a taste of salt.B．This result thus shows that the time when they were trained decided the effect of their learning.C．They are often more active and tend to arch for food during the night.D．They were also found to like sugar water, but not salt water.E．Cockroaches have the same problem!F．But they prefer warm conditions found within buildings.G．Pest species adapt easily to their environment. 题型：未知难度：其他题型

答案

小题1:E小题2:D小题3:A小题4:B小题5:C

点击查看序数词知识点讲解,巩固学习

解析

科学家通过试验说明了蟑螂更适于夜间行动，在夜间它们身体的各个机能都好于早晨，所以工作效率也会更高。小题1:E 前面说到你不再孤单，即还有别人像你一样不喜欢早起、不喜欢早上学习，所以接下来就要说有同样问题的人或物是谁了。故选E项。小题2:D 根据下文中“with a taste of sugar water...”可知选D项。小题3:A 本段介绍了蟑螂对糖水和盐水不同反应的试验，前面介绍了糖水，接下来肯定要说到盐水。故选A项。小题4:B 此处是一个总结句，是对以上试验的一个结论。故选B项。小题5:C 试验证明了蟑螂在夜间的反应更快，所以效率也会更高。故选C项。

考点

据考高分专家说，试题“Do you have trouble .....”主要考查你对 [序数词 ]考点的理解。 序数词

序数词的概念：

表示顺序的数称为序数词。如：first, cond, third, fourth。

序数词的构成与用法：

1、序数词的构成：①一般来说，是由相应的基数词加词尾th构成。   例：four＋th→fourth   six＋th→sixth    ven＋th→venth   ten＋th→tenth②下面这些基数词在变为序数词时，有特殊的变化。例：one→first    two→cond    three→third    five→fifth    eight→eighth    nine→ninth    twelve→twelfth③十位整数序数词的构成方法是将基数词的词y变成i，然后再加eth。例：twenty→twentieth    thirty→thirtieth    forty→fortieth    ninety→ninetieth④两位或两位以上的基数词变成序数词时，仅将个位数变成序数词。例：twenty－one→twenty－first    thirty－five→thirty－fifth    a hundred and fifty－three→a hundred and fifty－third2、序数词的用法：①序数词在使用时，一般加上定冠词。例：the first book    the cond floor    the third day    the fourth week．②序数词在多数情况下都用作定语，有的也可以作表语、主语和宾语。例：The may1st is Labour Day. 五月一日是劳动节。    My room is on the cond floor. 我的房间在二楼。    The first is larger than the con.（主语）第一个比第二个大。    Read the book from the first.（宾语）从开头读这本书。    You'll be the sixth to write.（表语）你将是第六个写的。③序数词的前面可以加上不定冠词，用来表示“再一”，“又一”的意思。例：You may have a third try. 你可以第三次尝试。

序数词知识体系：

 

约数的表达方法：

用tens/dozens/scores/hundreds/thousands/millions of 表示“几十、几百、上千、成千上万”等。 如：The boy bought dozens of pencils.       Thousands of people died in the earthquake. 注意： (A)：dozen, score, hundred, thousand, million等表示确切数量时，不用复数。 如：five dozen (of) eggs   五打鸡蛋    hree hundred people  三百个人

分数词的构成和用法：

1）分数词构成法：分数词（FractionalNumerals）由基数词和序数词构成，基数词代表分子，序数词代表分母。除了分子为1的情况下，序数词都要用复数形式：如：1/4：one-fourth    5/9：five-ninths    2/3：two-thirds   17/5：three and two-fifths   7/12：ven-twelfths   379/8：forty-ven and three-eighths此外还有下面表示法：如：1/2：a(one) half    1/4：a(one) quarter    3/4：three-quarters    9/4：two and a quarter    3/2：one and half     31/4：ven and three quarters