Lingling switches on the laptop_____ opens a new document.She wants _____

write her homework.?[ ]

A. and; to

B. to; an

C. for; to

D. and; or

农业社会，长江中下游平原发展水稻种植业的有利条件是(    )

①亚热带季风气候，水热条件好     ②地势平坦，河湖密布     

③肥沃的水稻土 ④人口稠密，劳力充足      ⑤机械化程度高

A．①③④⑤

B．①②④⑤

C．①②③⑤

D．①②③④