题目

语法填空At the moment, Daming and Lingling (talk) about the year 2050 in the classroom. What will our world be like in the year 2050? asks Daming. Well, no one knows, but it's (interest) to guess (猜测), says Lingling. I think in the year 2050, everyone will carry a small computer. The computer will give people the answers to all the questions. We'll have new telephones too. And we'll be able to talk to our friends all over the world and see them at (冠词) same time.A lot of people would like (live) and work in the sea.In the future, there (be) big towns, (factory) and farms in the将纯合的野鼠色小鼠与棕色小鼠杂交，F1代全部表现为野鼠色。F1个体间相互交配，F2代表现型及比例为野鼠色：黄色：黑色：棕色=9:3:3:1。若M、N为控制相关代谢途径的显性基因，据此推测最合理的代谢途径是（ ）