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题型：单选题 题类：常考题 难易度：普通
牛津上海版（试用本）2018-2019学年小学英语四年级上册Module 4 The natural world Unit 2 At Century Park Exercise 1
—They are Lingling's.
—It is about ten kilometres long.
—He's Ben's brother.
—Because he made first letters in Braille.
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