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第77页

信息发布者：

dirty

dead

rubbish

messy

keep

bin

metro

air

plant

【解析】：
这是一道英语编创对话的题目，考查学生对描述环境脏乱原因及保持清洁方法的英语表达掌握情况。解题关键在于根据图片内容，运用正确的英语句式和词汇进行对话编写。
【答案】：
a
S1: What made your desk messy?
S2: The papers and books made my desk messy.
S1: What can we do to keep the desk clean?
S2: We can put the papers and books in order.
b
S1: What made the river dirty?
S2: The rubbish made the river dirty.
S1: What can we do to keep the river clean?
S2: We can stop throwing rubbish into the river.
c
S1: What made your bedroom messy?
S2: The clothes and toys made my bedroom messy.
S1: What can we do to keep the bedroom clean?
S2: We can put the clothes in the wardrobe and the toys in the box.

1 dirty, dead 2 rubbish, messy 3 keep, bin 4 metro, air 5 plant