题目内容
种子传病的效应包括植物病原的致病效应和流行效应。
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How many nonlinguistic forms of communication are mentioned in this passage？
In the last paragraph, the phrase "this wide, confused wilderness" refers to ______.
What seems to be the problem？
Sign language is said to be very vivid and exact and can be used internationally while ______ cannot.
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