Unit 1 Section Ⅲ Using Language，Assessing Your Progress to Video Time（作业）-2022-2023学年新教材高中英语选择性必修第二册【精讲精练】人教版

[课时作业] [限时30分钟] Ⅰ.阅读理解 Back in 1988，Red Delicious made up 70 to 80 percent of the domestic apple market.Over the years，farmers sold a lot of them because they looked great.But they had a floury texture (口感)，and people want an apple that's firm，crisp and juicy.I started searching for the one.By 1994，threatened by varieties from Japan and New Zealand，the U．S.apple industry and Washington State University agreed that we had to grow our own. First，we cross­pollinated (异花授粉) existing apples：Collect pollen from one flower，put it on the tip of a pencil eraser，and rub it into another.We crossed dozens of crisp，tasty varieties such as Gala，Fuji，and Pink Lady.But the best breed came out of Honey crisp and Enterprise parents.The crossbred seeds grew into 5­foot trees，and we grafted those onto rootstocks (根茎) to make them start producing quickly，and planted them in evaluation gardens.A few years later，they fruited—and we began tasting. So I would walk down long rows of hundreds and thousands of trees，and when I found an attractive fruit，I'd bite，chew，and spit it out.Most were terrible，but when I found one with good texture and taste，I'd pick 10 or 20 of them.Then I put them in cold storage to see how they would hold up after a few months.After that，three or four researchers sat down and tasted every apple.We checked acidity and sugar levels，which can change over time，and tested firmness and crispness using instruments that measure pressure and cell breakdown. When we found exactly what we wanted，we planted and tested them all over again. Eventually，we ended up with Cosmic Crisp.It can spend nine to twelve months in storage，and stay crisp，firm，juicy and sweet. 1．What does the author mainly tell us? A．Why Red Delicious sells best. B．How apples with a good texture are grown. C．Why apples cross­pollinated taste nice. D．How a new variety of apple comes into being. 2．How do the researchers grow Cosmic Crisp? A．By testing acidity and sugar levels. B．By crossbreeding with good variet