Jim records his physical training every time so that he can________it and think about how he should improve it the next day.
A:attach to
B:break up
C:refer to
D:keep on
中日关系发展不会是一片坦途,既合作又斗争将是常态。未来发展中日关系,将是“以斗争求合作”。“以斗争求合作”说明( )
大力发展科技事业,必须( )
蚯蚓生活的地方土壤疏松,肥力强,可以使草长得更旺盛,这说明( )