若 a =(1,2,λ), b =(1,0,0), c =(0,1,0),且 a , b , c 共面,则λ=( ) A.1 B.-1 C.0 D.±1
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【简答题】第二部分: 语言综合运用 V . 完形填空: All over the world people enjoy sports. Sports help people to keep 1 , happy and to live 2 . People play different s in winter and summer. 3 is good for swimming. And in win...