题目

已知一个有两边相等的三角形的一边长为5，另一边长为7，求这个三角形的周长? 答案：当5为等边的长时，周长为5+5+7＝17，当7为等边的长时，周长为5+7+7＝19； 阅读下面短文，从每题所给的三个选项(A、B和C)中，选出最佳选项。 　　An elephant wants to make some friends．He see a monkey in a tree and asks, “Can you be my friend? ” 　　“You are too big．You can't swing(摇荡)in the tree like me．” 　　Then the elephant meets a panda．“Please be my friend．” he says． 　　“How can I? Sorry, sir．You are too big．” 　　The elephant is very sad(伤心)．Then he goes home． 　　The next day, he sees all the animals running．He doesn't know why．A rabbit tells him that there's a tiger near here．He is coming to eat the animals． 　　The elephant goes to the tiger．“Mr．Tiger, don't eat the animals, please” 　　“Go away(走开)! ” says the tiger． 　　The elephant is not happy and kicks(踢)the tiger．Then the tiger goes away． 　　At last, all the animals want to make friends with the elephant． (1) What does the elephant want to do? [　　] A． To look for some food． B． To make some friends． C． To see the tiger． (2) The panda doesn't want the elephant to be his friend because ________? [　　] A． The elephant is too big． B． The elephant's nose is long． C． The elephant eats too much． (3) Why are the animals running? [　　] A． Because they are playing games． B． Because they don't want to see the elephant． C． Because a tiger is coming to eat them． (4) There are ________ kinds of animals in this story． [　　] A． four． B． five． C． six． (5) Which of following is right? [　　] A． When you are big, you can't find friends． B． The elephant doesn't have friends at last(最后)． C． After the elephant helps others, he has many friends．