While my mother was cooking, my father was newspaper.
A:read
B:to read
C:reading
D:reads
选择方框中的动词词组填空。
laugh at agree with take off be late for get on
下面措施中,哪一种对保持生态环境最有利?( )
两条同样长的绳子,第一条剪去了13 ,第二条剪去了14 ,第几条剪去的长一些?答案是( )。