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________。
| A．①② | B．②③④ | C．①③ | D．②④ |
这是一篇宣传环保的短文，内容介绍新泽西哈特威尔市卡蓬湖三十年前后的变化．三十年前湖畔鸟、兽成群，湖中游鱼成线；而现在由于污染所致，明镜的湖水成了暗褐色的泥浆，杂草丛生．那么如何才能恢复原貌呢？请看下文：
Thirty years ago, Lake Ponkapog in Hartwell, New Jersey, was full of life. Many birds and animals lived beside the water, which was full of fish. Now there are few birds, animals and fish. The lake water is polluted(污染的). It is in a colour of dirty brown, and it is filled with strange plants.
How did this happen? First, we must think about how water gets into Lake Ponkapog. When it rains, water comes into the lake from all around. In the past, there were forests all around Lake Ponkapog, so the rainwater was clean.
Now there are many homes around the lake. People often use chemicals(化学品) in their gardens. They use other chemicals inside their houses for cleaning or killing insects(昆虫). There are also many businesses. Businesses use chemicals in their machines or shops. Other chemicals fall onto the ground from cars or trucks. When it rains, the rainwater picks up all the chemicals from homes and businesses and then carries them into the lake. "They pollute the water and kill the animals.
Boats on the lake are also a problem. Lake Ponkapog is a popular place for motorboats. But oil and gas(油和汽) from boats often get into the lake. So more bad chemicals go into the water this way.
People in Hartwell are worried. They love their lake and want to save it. Will it be possible? A clean lake must have clean rainwater going into it. Clean rainwater is possible only if people are more careful about chemicals at home and at work. They must also be more careful about gas and oil and other chemicals on the ground. And they mustn't use motorboats any more on the lake. All these may change people's lives. Only then can Lake Ponkapog be a beautiful, clean lake again.
1．In the past, the water in Lake Ponkapog was made clean by ________.
[ ]
2．Chemicals from homes and businesses ________.
[ ]
A．are always clean
B．can help the animals
C．are good for the lake
D．get into the rainwater
3．Cleaner rainwater will mean ________.
[ ]
A．more boats on the lake
B．more dirty things in the lake
C．a cleaner lake
D．a dirtier lake
4．To save Lake Ponkapog, people need to ________.
[ ]
A．be more careful about chemicals
B．use less water
C．grow fewer plants in the gardens
D．use more motorboats on the lake
5．The passage is about ________.
[ ]
A．boats on Lake Ponkapog
B．why the water in Lake Ponkapog is dirty
C．clean rainwater
D．dirty lakes
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