。 air fresh enjoy breathing you (?) 2. you aknow of lot trees. scientists understand to beginning are now only in are danger(?) 5. against we destroying are best our pollution fighters 答案一. cfdegbaikmhlnj 二. 1—BBA 6— 10 CBBAC 11— 15 DCCDA 三. 1—5 BADBA 6— 10 ADCAC 四. 1— 6— 10 BCDBA 11— 15 五. 1. interested in 2. communicate with down 4. in order out 六. 1. going 2. join 5. see 七. you enjoy breathing fresh air? know a lot about trees. 3. Scientists are only now beginning to understand them. 4. Are trees in danger? are destroying our best fighters against pollution.
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