Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m behind A and when B finishes ——青夏教育精英家教网——

摘要：Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m behind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished? (Let’s assume all the athletes run at a constant speed) Answer:

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There are nineteen boys and twenty-eight girls in our class. 1 　the boys is English. His 2 is Sam. He is thirteen. Two of the 3 are American. They are twins. 4　names are Lucy and Jane. They are twelve. They are my 5　. All of the other boys and girls are 6 　. We all like the English boy and the American girls, 7 they like us, too. We play games together（一起）. We help 8 and they help us.
　　Look, there 9 the twins! They are coming this way. Let's 10 hello to them.

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5、In a triangle，if measures of three angles are x，2x and 3x respectively，then the measure of the largest angle is（　　）
（英汉词典triangle：三角形，Measure：量度，the largest angle：最大角．）

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Given in the△ABC，a，b，c are three sides of the triangle，a=3，b=10 and perimeter of the triangle is multiple of 5，then the length of c is

．
（英汉小词典：side：边；perimeter：周长；multiple：倍数）

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The coordinates of the three points A．B．C on the plane are （-5，-5），（-2，-1）and（-1，-2）respectively，the triangle ABC is（　　）
（英汉小词典：right直角的；isosceles等腰的；equilateral等边的；obtuse钝角的）

A、a right trisngle

B、an isosceles triangle

C、an equilateral triangle

D、an obtuse triangle

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Given in the△ABC，a，b，c are three sides of the triangle，and

，then∠A is（　　）
（英汉词典acute angle：锐角；obtuse angle：钝角）

A、acute angle

B、right angle

C、obtues angle

D、acute angle or obtues angle

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