夜晚当我们抬头仰望天空时常发现星星会"眨眼",请用你学过的光学知识解释这一现

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• 2.The glass is filled with milk..(保持原意) The glass is _________ ________ milk.3.The Olympic games will be held every four years .(对划线部分提问) __________　__________ will the Olympic games be held?4.I am good at both singing and dancing.(改为否定句)I am good at _________ singing _______ dancing.5.Mary in not from Italy.Kate is not from Italy,either.(合并成一句)________ Mary nor Kate __________ Italy.
• 完成下面几件事：扫地3分钟,洗衣机洗衣服25分钟,拖地8分钟,洗碗6分钟,晾衣服5分钟.做完这些事至少要几分钟?