如果2(x+3)的值与3(1-x)的值互为相反数,求x的值。
解:依题意得,2(x+3)+3(1-x)=0
解方程,得x=9
所以,x的值为9。
It is generally believed that constant reading and comprehending can ______ our mental ability of comprehension while physical exercise can help build up our body.
A.stress
B.effect
C.strengthen
D.decide
请将人体消化系统图中标注的有关结构与其功能对应起来,填在空白处。
A.消化和吸收的主要场所
B.能暂时贮存食物残渣
C.可初步消化蛋白质
D.能分泌胆汁E.能分泌胰液
① ;④ ;⑤ ;⑥