题目

甲、乙两数的比是2：3,甲占甲、乙两数和的（ ）A. B. C. D. . 答案：【答案】B【解析】解：甲占甲、乙两数和的：2÷(2+3)=.故答案为：B用甲的份数除以甲乙两个数的份数和即可求出甲数占甲、乙两数和的几分之几.第二节 根据语境，选择恰当的短语完成下列各句。【1】Scientists_________are working together to find a cure for AIDS.【2】Everyone _________something, but some people are truly talented.【3】It's very hard for the climbers to________air as they get near the top of Qomolangma.【4】The dragon plays an important part in Chinese festivals.It is______the Chinese nation.【5】______,many countries hope to build trade relations with China because of the"Belt and Road".