Maryisn’tfreeonSundays.Sheoftenhelpsoldpeopledothehou...
问题详情:
Mary isn’t free on Sundays. She often helps old people do the housework at the old people’s home. She is good with old people. She always talk to them. And she often tells them stories and plays games with them. She makes friends with them. They all like her. After dinner, she rides her bike home. Though she is tired, she is happy.
填空。每空一词
Mary is 1.________ on Sundays. She often helps old people 2._________ the housework at the old people’s home. She is good with old people. She always talk to them. And she often tells stories 3_______ them and plays games with them. She makes friends with them. They all like her. After 4.________ dinner, she goes home 5.________ bike. Though she is tired, she is happy.
【回答】
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知识点:短文填空
题型:阅读填空
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在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降...
问题详情:在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降为1.8mol,则前20s的平均反应速度为()A.v(B)=0.03mol/(L•s)B.v(B)=0.045mol/(L•s)C.v(C)=0.03mol/(L•s)D.v(C)=0.06mol/(L•s)【回答】考点:化学反应速率和化学计量数的关系.专题:化学反应速率专...
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