单选题有一个球从人行道上8米高的窗户处扔下，每一次反弹都是上一次下落距离的一半，求第五次反弹的高度?
单选题What is the least number of digits including repetitions needed to express 1.23456789×10200 in decimal notation?
单选题书架上有10本不同的音乐杂志，5本不同的数学杂志，4本不同的美术杂志，取这三种杂志各一本，问有多少种不同的取法?
单选题How many cubic centimeters of a solution that contains 15 grams of glucose per 100 cubic centimeters must be added to 45 cubic centimeters of a solution that contains 25 grams of glucose per 100 cubic
单选题在某一种溶液中，牛奶、酒精、水的比例是4：100：200；现在溶液发生了改变，牛奶、酒精的比例增倍，而牛奶、水的比例减半，如果改变后的溶液一共含有1000立方厘米的酒精，那么溶液中含有多少立方厘米的水?
单选题The number n is between 2 and 8, inclusive, on the number line means which of the following?
单选题What is the smallest positive integer k for which 784 is a factor of 14k?
单选题Is △ABC isosceles?1∠A and∠B don’t have the same measure.2∠A and∠B have the same measure.
单选题The Sumpton town council recently voted to pay a
单选题Which of the following integers does NOT have a factor greater than 1 that is the square of an integer?
单选题Which of the following most logically completes
单选题If S is the sum of the first n positive integers, what is the value of n ?1 S220
改错题Because of the sharp increases in the price of
改错题As business grows more complex, students
改错题Despite the Puritan sumptuary laws prohibiting
改错题An analysis of tree bark all over the globe
改错题Because the collagen fibers in skin line up in
改错题In 1776 Adam Smith wrote that it is young people