原式=(a+1)(a-1)(a+1)2×a+1a(a-1)=1a.
根据下列句子及所给汉语注释,写出空缺处各单词的正确形式,每空只写一词。
1. May is the (第五) month of a year.
2. He left a (口信) saying he would be a little late.
3. How long can I (借) the book?
4. If you want to be (瘦些),you have to eat less food.
5. We're free now. How about (放)kites?
用电缆车换电缆时,电铲司机必须在电缆车()米外朝来车方向作好拦车防护。
A、50
B、100
C、200