Most of us think that great ideas were the result of genius thinking. However, many of the greatest discoveries and inventions in history began with very simple beginnings. In the 18th century, James Watt was boiling water at home. As the water began to boil, he suddenly noticed that the steam was pushing the lid of the kettle. From this, he created the steam engine. In ancient Greece time, Archimedes stepped into a bath tub and felt that water was being pushed out when he stepped in. This is how he came up with the idea of how to find the purity of gold. In the 17th century, Isaac Newton was sitting under a tree when an apple fell and hit him on the head. This is when he realized the pulling force of the earth - the gravity. There are many other examples of how great ideas began with simple beginnings. What one needs to become an inventor are careful (observation) and a lot of hard work. 38 James Watt lived in ______. A. the 17th century B. the 18th century C. the ancient Greece time D. 1867 39 Archimedes came up with the idea of how to find purity gold when ______. A. he was boiling water B. he was hit by an apple C. he was stepping into the bath tub D. he was sleeping 40 Question 30. Many great ideas began with _____. A. genius thinking B. talent thinking C. long time working in laboratories D. simple beginnings 41 Which of the following can be the best title for the passage? A. James Watt, Archimedes and Isaac Newton. B. Steam Engines, Gold and Gravity C. Great Ideas with Simple Beginnings D. Simple things 42 What does the word "observation " in line 10 mean? A. watching B. examine C. studied D. survey Americans usually (23) ______ up very early. They have breakfast between six and nine. They usually have bread or a sandwich and a cup of tea or coffee for breakfast. Most people eat a quick (24) _______ at twelve or twelve thirty. The big meal of the day (25) ______ usually dinner. This is usually between six and seven o’clock in the evening . They usually have meat, fish, vegetables and fruit (26)_________ dinner. They often (27)________ beer or wine, too. 33 A. eat B. sleep C. take D. get 34 A. dinner B. lunch C. supper D. breakfast 35 A. does B. is C. do D. going 36 A. with B. at C. for D. of 37 A. buy B. eat C. sell D. drink ( Gấp ạ )

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Giải BPT: (x+2)(x-1) < (x+3)^2 - 5

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Viết phương trình chính tắc của Elip có trục lớn gấp đôi trục bé và có tiêu cự bằng "4 căn 3" A. $\frac{x^{2}}{36}$+$\frac{y^{2}}{9}$=1 B. $\frac{x^{2}}{36}$+$\frac{y^{2}}{24}$=1 C. $\frac{x^{2}}{24}$+$\frac{y^{2}}{6}$=1 D. $\frac{x^{2}}{16}$+$\frac{y^{2}}{4}$=1

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Cho các công thức hóa học sau : CaO, NO2,HCl,NaOH,CuSO4,P2O5,Fe2O3,Al(OH)3,CaCO3. hãy phân loại các chất trên và đọc tên chúng.