单元自测试卷八年级英语下学期人教版
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（
B
）8. How do plants warn each other about danger?
A. By making loud noises.
B. By sending out chemicals.
C. By changing colour.
D. By moving quickly.
答案：B
解析：文中提到“when a plant is attacked by insects, it sends out chemicals to warn nearby plants.”，植物通过释放化学物质来警告同类危险，B选项正确。
（
D
）9. What does the Venus flytrap do to catch insects?
A. It folds its leaves slowly.
B. It sends out chemicals.
C. It produces a sweet smell.
D. It closes its leaves very fast.
答案：D
解析：根据“The Venus flytrap (捕蝇草) closes its leaves in less than a second to catch insects.”可知，捕蝇草通过快速闭合叶子捕捉昆虫，D选项正确。
（
A
）10. How do large trees help young trees?
A. By sharing nutrients through fungi networks.
B. By giving them shade.
C. By scaring away insects.
D. By protecting them from wind.
答案：A
解析：文中指出“Large trees share nutrients with young trees through underground fungi (菌类) networks.”，大树通过真菌网络与小树共享养分，A选项正确。
（
D
）11. Which is the best title for the passage?
A. Wood Wide Web
B. The New Ways Plants Interact with Their Environment
C. Plants Can Help Each Other
D. The Secret Life of Plants
答案：D
解析：文章整体介绍了植物能交流、防御、移动以及互助等不为人熟知的“秘密生活”，D选项“植物的秘密生活”最能概括全文主旨。
