A、Marble
B、Blood vessel
C、Paper
D、Cloud
What do you call a bear with no teeth?(没有牙齿的熊叫什么？)
What has keys but can't open locks？
On which day are people always tired?（人们在哪一天总是疲惫不堪？）
What is the best year for a kangaroo?（袋鼠的幸运年是什么？）
What makes the Tower of Pisa lean?（比萨塔为什么是斜的？）
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