补全单词。
①My parents have ret____ed.(退休的)
② She worked in the f____lds(田地).
有关地震波的说法,正确的是( )
如图,在矩形ABCD中,E为BC上一点,AE⊥DE,∠DAE=30°,若DE=m+n,且m、n满足m=n-8+16-2n+2,试求BE的长.
选出适当的短语,完成对话。
three plates have lunch live in some carrots many computers