单选题求在1至100的自然数中能够被3或者7整除的数的个数?
单选题If the product of the integers w，x，y and z is 770，and if 1＜w＜x＜y＜z．what is the value of w+z?
单选题In a certain box, there are 3 times as many red balls as blue balls. Which of the following is the ratio of the number of red balls to the number of blue balls?
单选题某一矩形的一条边是4+3S，另一条边是8-S，问矩形的周长不可能是下面哪一个?
单选题一批货物中12具有特征A，23具有特征B，13两种特征都具有。如果80件货物既没有特征A又没有特征B，那么一共有多少件货物?
单选题Nutritionists are advising people to eat more
单选题一个试验中有三个事件A，B和C，其中PA=0.23，PB=0.40和PC=0.85。假设事件A和B互斥，事件B和C互为独立事件。那么PA or B和PB or C各为多少?
单选题Sparrow Airlines is planning to reduce its costs
单选题在一次宴会上一共有12个人，如果每个人和其他的人各握手一次，那么一共有多少次握手?
单选题Is x less than y ?1 x-y+102 x-y-l0
单选题The rate at which a road wears depends on
单选题在一个有n个数的序列中，数15比序列的median少了1.5个deviation，数22比median多了2个deviation，求这个序列的median。
单选题Machines X and Y run at different constant rates，and machine X can complete a certain job in 9 hours． Machine X worked on the job alone for the first 3 hours and the two machines，working together，then
单选题The chemical adenosine is released by brain
单选题There are five positive numbers n+2, n+1, n-2, n and n+9, which of the following could be the difference between the mean and the median?
单选题A bank account earned 2% annual interest, compounded daily, for as long as the balance was under $1,000, starting when the account was opened. Once the balance reached $1,000, the account earned 2. 5%