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¡¡¡¡¡¡Îã¡§¡¡(Yesterday) something <strange> happened.
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¡¡¡¡¡¡¡¡¡¡¡¡( In the library ) a man <in uniform> spoke ¡¡¡¡¡¡¡¡to me.
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¡¡¡¡¡¡£±¡¡ To pass the exam the boy in the room is studying hard.

¡¡¡¡¡¡£²¡¡¡¡ When I saw him the man driving the bus smiled.

¡¡¡¡¡¡£³¡¡¡¡ If you want to be a doctor, someone I know will help you.


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¡¡¡¡¡¡£²¡¡¡¡ ¡ÊWhen I saw him¡Ë the man ¡ãdriving the bus¡ä ¡¡¡¡¡¡smiled.
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Thank you for your letter.¡¡Your report about water pollution was very interesting.¡¡I'm also interested

in the problem of water pollution.¡¡I'd like to tell you about a small lake in my city.¡¡The water of the lake

was very clean about 30 years ago.¡¡There were a lot of fish, and children could swim in the lake.¡¡

But people stopped swimming there about 20 years ago because it was polluted.

¡¡Now, the lake is still polluted and I want to make the lake clean again.¡¡But how?¡¡One day, I went

to the city library and found two graphs.¡¡Look at Graph A.¡¡We use "COD" to measure the

degree of water pollution.¡¡A large COD means that there is much pollution in the water.

Ãí¡Ëpollution ±øÀ÷¡¡¡¡pollute ±øÀ÷¤¹¤ë¡¡¡¡COD ²½³ØÅª»ÀÁÇÍ×µáÎÌ¡¡¡¡measure ¬Äꤹ¤ë¡¡degree ÄøÅÙ

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Thank you for your letter.¡¡Your report <about water pollution> was very interesting.
¡¡¤¢¤ê¤¬¤È¤¦¡¡¼ê»æ¤ò¡¡¡¡¡¡¡¡¡¡¤¢¤Ê¤¿¤ÎÊó¹ð¡Ê¤Ç¡Ë¿å¼Á±øÂù¤Ë´Ø¤·¤Æ¤Î¡¡¤Ï¡¡¤È¤Æ¤âÌÌÇò¤«¤Ã¤¿¡£

I'm also interested in the problem of water pollution.¡¡I'd like to tell you about a small
»ä¤â¤Þ¤¿¶½Ì£¤¬¤¢¤ë¡¡¡¡¤½¤ÎÌäÂê¤Ë¡¡¡¡¡¡¿å¼Á±øÂù¤Î¡¡¡¡»ä¤Ï¤¢¤Ê¤¿¤Ë¸À¤¤¤¿¤¤¡¡¾®¤µ¤Ê¸Ð¤Ë

lake in my city.¡¡The water <of the lake> was very clean about 30 years ago.¡¡There were
¤Ä¤¤¤Æ¡¡»ä¤Î³¹¤Î¡¡¡¡¤½¤Î¿å¡Ê¤Ç¡Ë¸Ð¤Î¡¡¡¡¡¡¤Ï¡¡¤È¤Æ¤â¤­¤ì¤¤¤À¤Ã¤¿¡¡Ìó30ǯÁ°¡¡¡¡¡¡¤¤¤¿¡¡¡¡

a lot of fish, and children could swim in the lake.¡¡But people stopped swimming there
¤¿¤¯¤µ¤ó¤Îµû¤¬¡¡¤½¤·¤Æ¡¡»Ò¶¡Ã£¤Ï±Ë¤²¤¿¡¡¸Ð¤Ç¡¡¡¡¡¡¡¡¤·¤«¤·¡¡¿Í¡¹¤Ï¤ä¤á¤¿¡¡¤½¤³¤Ç±Ë¤°¤Î¤ò¡¡

about 20 years ago because it was polluted.
Ìó20ǯ¤¯¤é¤¤Á°¤Ë¡¡¤Ê¤¼¤Ê¤é¤½¤ì¤Ï±øÀ÷¤µ¤ì¤¿¤«¤é¤À

¡¡(Now), the lake is still polluted and I want to make the lake clean again.¡¡¡¡¡¡¡¡But how?
¡¡¡¡º£¡¡¤½¤Î¸Ð¡¡¤Ï¡¡¤Þ¤À±øÀ÷¤µ¤ì¤Æ¤¤¤ë¡¡¤½¤·¤Æ¡¡»ä¤Ï¤·¤¿¤¤¡¡¸Ð¤ò¤­¤ì¤¤¤Ë¡¡ºÆ¤Ó¡¡¤·¤«¤·¤É¤¦¤ä¤Ã¤Æ¡¡

(One day), I went to the city library and found two graphs.¡¡Look at Graph A.¡¡
¤¢¤ëÆü¡¡¡¡»ä¤Ï¹Ô¤Ã¤¿¡¡Ä®¤Î¿Þ½ñ´Û¤Ë¡¡¡¡¤½¤·¤Æ¡¡¸«¤Ä¤±¤¿¡¡£²¤Ä¤Î¥°¥é¥Õ¤ò¡¡¥°¥é¥ÕA¤ò¸«¤Æ¡¡

We use "COD" to measure the degree of water pollution.¡¡¡¡¡¡¡¡¡¡A large COD means that
»äã¤Ï»È¤¦COD¤ò¡¡·×¤ë¤¿¤á¤Ë¡Ê²¿¤ò¤«¤È¤¤¤¦¤È¡Ë¿å¼Á±øÀ÷¤ÎÄøÅÙ¤ò¡¡¡¡Â礭¤ÊCOD¤Ï°ÕÌ£¤¹¤ë¡Ê²¿¤ò¤«¤È¤¤¤¦¤È¡Ë

there is much pollution in the water.
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Thank you for your letter.¡¡Your report / about water pollution / was very interesting.
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Ê¤Ç¡Ë¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ë´Ø¤·¤Æ¤Î¡¡¡¡¤Ï¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤À¤Ã¤¿

I'm also interested / in the problem / of water pollution.¡¡I'd like to tell you / about a small
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ç¤¹¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ë¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Î¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤·¤¿¤¤¤Ç¤¹¡¡

lake / in my city.¡¡The water / of the lake / was very clean / about 30 years ago.¡¡There were
¤Ë¤Ä¤¤¤Æ¡¡¡¡¡¡¤Î¡¡¡¡¡¡¡¡¡¡¡Ê¤Ç¡Ë¡¡¡¡¡¡¡¡¡¡¡¡¤Î¡¡¡¡¡¡¤Ï¡¡¡¡¡¡¡¡¡¡¡¡¤À¤Ã¤¿¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ë¤Ï¡¡¡¡¡¡¡¡¡¡¤¢¤Ã¤¿¡¡¡¡

a lot of fish,/ and children / could swim / in the lake.¡¡But people stopped / swimming there
¡¡¡¡¡¡¡¡¡¡¡¡¤¬¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ï¡¡¡¡¡¡¡¡¡¡¤Ç¤­¤¿¡¡¡¡¡¡¡¡¡¡¡¡¤Ç¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤·¤¿¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤¹¤ë¤Î¤ò¡¡

/ about 20 years ago / because it was polluted.
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ë¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤À¤Ã¤¿¤«¤é¤À

¡¡Now, the lake / is still polluted / and I want to / make the lake clean again.¡¡¡¡¡¡¡¡But how?
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¤Ï¡¡¡¡¡¡¡¡¡¡¤µ¤ì¤Æ¤¤¤ë¡¡¡¡¡¡¡¡¡¡°Ê²¼¤·¤¿¤¤¡Ê¤Ä¤Þ¤ê¡Ë¡¡¡¡¡¡¡¡¡¡¡¡¤Ë¡¡¡¡¡¡¡¡

One day, I went / to the city library / and found / two graphs.¡¡¡¡¡¡¡¡¡¡Look at Graph A.¡¡
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We use "COD" / to measure / the degree of water pollution.¡¡¡¡¡¡¡¡¡¡A large COD / means / that
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there is much pollution / in the water.
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