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一、CDBCDBDCADDCAAB二、 1. Eight. 2. Theearth. 3. The galaxy. 4. It is too large to imagine. 三、 1. C 2. A 3. B 4. E四、 1. There has been life 2. so wonderful that I have seen it 3. I don’t think there islife 4. has an environment likethat 5. It’s impossible toimagine

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I.1-5 BAACB II. 1. habit 2. century 3. instead 4. tired 5.fresh 6. fruit III. 1. really 2. staying 3. sports 4. listening 5. Healthy IV. 1. build us up 2. insteadof 3. gets tired easily 4. Healthy eating habits5. doing exercise。