题目列表(包括答案和解析)
小博士：仔细观察下面的基数词和对应的序数词的区别和变化，你会发现这种变化是有规律的，你能归纳出来吗？请根据规律填出所缺的基数词和序数词，并特别注意黑体字的词。
one | first | eleven | eleventh | twenty-one | twenty-first |
two | second | twelve | twelfth | twenty-two | twenty-second |
three | third | thirteen | thirteenth | twenty-three | twenty-third |
four | fourth | fourteen | fourteenth | twenty-four | ______ |
five | fifth | fifteen | ______ | twenty-five | twenty-fifth |
six | sixth | sixteen | sixteenth | twenty-six | twenty-sixth |
seven | ______ | seventeen | seventeenth | twenty-seven | twenty-seventh |
eight | eighth | eighteen | eighteenth | twenty-eight | twenty-eighth |
nine | ninth | nineteen | nineteenth | twenty-nine | twenty-ninth |
ten | tenth | twenty | twentieth | thirty | thirtieth |
thirty-one | thirty-first fortieth ninetieth | hundred | hundredth | ||
forty | thousand | thousandth | |||
ninety | million | millionth | |||
我找到规律了！请看：
1 英语序数词1～19，除first，second，third等特殊形式外，其余的一般是在相应的基数词后加-th构成。
2 有几个序数词加-th时拼法不规则，要注意。如fifth，________ ________ ________。
3 十位整数的序数词的构成方法是先将其基数词的词尾“ty”中的“y”改为“i”，再加“-eth”。如________。
4 基数词“几十几”变成序数词时，只需将个位数变成序数词，十位数不变。如________。
先阅读短文，然后根据短文内容从方框内所给的单词中选择最恰当的词(注意词形变化)填入短文空白处，使短文完整、通顺。一词只用一次，一空限填一词。方框中有两个词是多余的。
Talk to someone if you are having problems with schoolwork．Speak up as soon as you can, so you can get help right away before you fall behind．
Your 1 are often a great place to start if you need help．Talk about your problem with them．They might be able to 2 you how to do a difficult math problem or help you think of a topic to write about for English class．They also can be helpful by finding that perfect place in the house for you to do your homework and keeping supplies, like pencils, on hand．They also can cut down on distractions(分心的事)like 4 younger brother and sisters!
Teachers are also important to you because they can give you advice about the assignment(作业)you are 5 trouble with．They also can help you set up a good system for writing down your assignments and remembering to put all necessary books and papers in your backpack．Teachers can give you study tips and offer ideas about how to 6 with homework．Helping kids learn is their job, 7 be sure to ask for advice．
Many schools, towns and cities offer after-school 8 to kids．They often help kids with their homework and organize kids to 9 in different kinds of activities．There, you will not only be able to get some help from adults, but also from other kids．
You can also use the Internet to 10 online homework help sites．These sites can lead you to good resources(资源)for research and offer tips and guidance about many 11 ．But be careful about just 12 the information from an Internet website．Talk with your teachers about bow to use the resources properly．
写出下列数字的基数词和序数词.
1.2.3.4.8.9.12.16.20.31.
阅读短文，从方框中选择行当的词并用其正确形式填空，使短文意思通顺、完整。请将答案写在短文后相应题号的横线上。每空限填一词，每词限用一次。方框中有两个词是多余的。
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dirty with have always time they large want speak lesson first drop |
After a quick breakfast, I went into the lecture hall in a hurry．A famous teacher was 1. to the students．He was holding up a $100 bill．Then he said to the three hundred students，“Who would like this $1 00 bill?” The students put up 2.hands at once．Then he said，“I am going to give this $100 bill to one of you，but 3.，let me do this．”He made the bill into a ball．Then he said. “Who4. it now?” The hands went back into the air．“Well,” he said，“what if I do this?” and he 5. it on the floor and stepped on it．He picked up the 6.bill and said．“Who still wants it?” Hands went back again into the air．
“My friends,” he said，“you have learned a valuable(有价值的)7. today．No matter what I did to the $100 bill! Many 8. in our life，we are dropped and stepped on．We feel as if we are worth nothing．But remember, no matter what 9. happened to you，you will never lose your value：You are 10. valuable to those people who love you．Your value doesn’t come from what you do or whom you know, but who you are．’’
阅读短文，用方框中所给词的适当形式填空，使文章通顺、完整。每空限填一词，每词限用一次。方框中有两个词是多余的。
| shoe，he，have，happy，for，outside，hear，what，sad，feel，so，which |
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