题目

1．My grandma likes to be with the young though she is in her _________ now. 2．Those __________ books will be donated to the schools in poor areas. 3．It is difficult work, but the sense of _________ is huge. 4．The patient is getting much better after the operation and now she can look after _________. 5．To make a green world, we should try to reduce air _________ by walking more and driving less.下列四个命题中，是真命题的是（　 　）A.两条直线被第三条直线所截，内错角相等．B.如果∠1和∠2是对顶角，那么∠1=∠2．C.三角形的一个外角大于任何一个内角．D.无限小数都是无理数．