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29.Which is the negative effect of poor sleep on teens?A.They easily feel anxious and upset.B.They are tired of attending school.C.They may have bad learning habits.D.They may suffer from being short.30.Which proposal does the California Teachers Association support?A.Parents'schedules shouldn't be in a mess.B.All public schools should follow the bill.C.Start times should be adjusted by local standard.D.After-school activities shouldn't be delayed so late.31.Which is the most suitable title for the text?A.Teens can have access to a good sleepB.A new law brings tired teens some reliefC.Teens are developing proper sleeping habitsD.Critics and advocates argue about poor sleepDAgriculture may feed the world,but it is also contributing to environmental problems.Agriculture production uses about 70%of the Earth's fresh water and makes up about a thirdof greenhouse gas emissions.But it doesn't have to.Farming is moving inside,and farmersaren't exactly what they used to be.Take for example Grover and Phil,two robots,or farmers of the future,working at IronOx,a farm tech company in Silicon Valley,planning to set up farms around the country inorder to grow crops closer to consumers in a greener way."We have different robots that arelooking after the plants.They can check and scan them for issues,and change the amount ofnutrients plants get and the amount of water they get,"explained Brandon Alexander,CEO ofIron Ox.Iron Ox's method is very different from what Alexander calls the“spray(偾洒)and pray'”approach to agriculture on a Texas farm,where he grew up and more chemicals create morequantity at the expense of quality."Besides,a lot of the water in field farming gets justwashed out and never actually reaches the plants.And when 70%of your fresh water is goinginto farming,only 10%of that actually reaches the plants.It's just generating a lot ofwaste,he said.However,the indoor farming allows farmers to grow any crop at any time,regardless of climate change..It also uses hydroponics(无土栽培)，growing crops without soilso water goes directly to the roots."In the indoor farming industry today,even with all the investments into it,these invest-ments are a drop in the bucket (in spite of the great potential of this new industry,headded.Iron Ox is now magnifying its business in more states.Alexander says the company willproduce about 100 times more produce over the next 18 months than it's currently producingto satisfy greater needs.【高二英语第6页（共10页）】·23-170B·