ItisthoughtthatonebillionpeopleItheworld, ishalfthew...
问题详情:
It is thought that one billion people I the world, is half the word’s workers, earn their living by farming.
A. if B. that C. which D. what
【回答】
B。句中“half the world’s workers”是对“one billion people in the world” 的补充说明, “that is”是 “that is to say”的省略说法,是*入语,that 并不是引导非限制*定语从句的,如果在 “that is”后加个逗号则更清楚,应选
B。
知识点:代词
题型:选择题
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下列反应的离子方程式正确的是( )A.在碳**镁溶液中加入足量Ca(OH)2溶液:Mg2++2HCO3-+C...
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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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光明在低头的一瞬 ...
问题详情: 光明在低头的一瞬 迟子建 ...
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