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开心形树形主要用作( )。 A. 干性强的树 B. 干性弱的树 C. 发枝力强的树 D. 发枝力弱的树

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参考答案B

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The pyramids were built by Egyptians under the orders of the Egyptian leader,whose title was Pharaoh

The pyramids were built by Egyptians under the orders of the Egyptian leader,whose title was Pharaoh.Pharaoh Cheops built the biggest thing ever built,the Great Pyramid,also known as Khufu.Cheops built a pyramid 770 feet on one side and 481 feet tall.How ancient builders managed to build these massive structures has never been fully answered.