A:10cm2
B:12cm2
C:14cm2
D:16cm2
找出每组单词中不同类的一项。
①____A. small B. tall C. shoe
②____A. angry B. think C. sad
③____A. window B. where C. what
④____A. to B. go C. do
⑤____A. winter B. week C. summer
求 (yz+1)(zx+1)(xy+1)(x2+1)(y2+1)(z2+1) 的值.