單元自測(cè)試卷八年級(jí)英語(yǔ)下學(xué)期人教版
注：當(dāng)前書(shū)本只展示部分頁(yè)碼答案，查看完整答案請(qǐng)下載作業(yè)精靈APP。練習(xí)冊(cè)單元自測(cè)試卷八年級(jí)英語(yǔ)下學(xué)期人教版答案主要是用來(lái)給同學(xué)們做完題方便對(duì)答案用的，請(qǐng)勿直接抄襲。
（
C
）4. How far do monarch butterflies travel?
A. 400 kilometers.
B. 40,000 kilometers.
C. 4,000 kilometers.
D. 4 kilometers.
答案：C
解析：根據(jù)文中“Every year, millions of monarch butterflies fly up to 4,000 kilometers from Canada and the United States to Mexico.”可知，帝王蝶飛行的距離是4000公里，C選項(xiàng)正確。
（
B
）5. How do monarch butterflies find their way to Mexico?
A. By following other butterflies.
B. By using the sun and Earth's magnetic field.
C. By asking humans for help.
D. By covering trees and making them look orange.
答案：B
解析：文中明確提到“Scientists believe they use the sun and Earth's magnetic field to find their direction.”，說(shuō)明帝王蝶通過(guò)太陽(yáng)和地球磁場(chǎng)辨別方向，B選項(xiàng)正確。
（
B
）6. Why are monarch butterflies important?
A. Because they make honey.
B. Because they pollinate flowers.
C. Because they eat harmful insects.
D. Because they plant milkweed.
答案：B
解析：由“Monarch butterflies are important because they pollinate flowers.”可知，帝王蝶的重要性在于它們能給花授粉，B選項(xiàng)正確。
（
A
）7. ______ is the only plant for monarch caterpillars to eat.
A. Milkweed
B. Orange
C. Flower
D. Potato
答案：A
解析：根據(jù)“People are planting milkweed, the only plant monarch caterpillars eat”可知，馬利筋是帝王蝶幼蟲(chóng)唯一的食物，A選項(xiàng)正確。
