單元自測試卷八年級英語下學(xué)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.”，植物通過釋放化學(xué)物質(zhì)來警告同類危險(xiǎn)，B選項(xiàng)正確。
（
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：根據(jù)“The Venus flytrap (捕蠅草) closes its leaves in less than a second to catch insects.”可知，捕蠅草通過快速閉合葉子捕捉昆蟲，D選項(xiàng)正確。
（
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 (菌類) networks.”，大樹通過真菌網(wǎng)絡(luò)與小樹共享養(yǎng)分，A選項(xiàng)正確。
（
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：文章整體介紹了植物能交流、防御、移動以及互助等不為人熟知的“秘密生活”，D選項(xiàng)“植物的秘密生活”最能概括全文主旨。
