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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