全国100所名校最新高考冲刺卷英语2023届Y1

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Metin Sitti at the Max Planck Institute for Intelligent Systems in Stuttgart,Germany,and his colleagues have developed tiny robots called "microrollers"that cancarry cancer drugs and selectively target human breast cancer cells.The team drewinspiration for the design of the robots from white blood cells in the human body,whichcan move along the walls of blood vessels (against the direction of blood flowThe microrollers are round and made from glass microparticles.One half of therobot was coated with a thin magnetic nanofilm(磁性纳米膜)made from nickel andgold.The other half was coated with the cancer drug doxorubicin as well as moleculesthat recognize cancer cells.The team tested the robots using mouse blood and artificial channels lined withhuman endothelial cells-the kind of cells that line the inner walls of our blood vessels.The robots were exposed to a mixture of cancerous and healthy tissue.The microrollersselectively attached to the cancer cells and were activated using UV light to release thedoxorubicin.By applying magnetic fields,the team was able to control the movement of themicrorollers,both with and against the flow of blood.The microrollers can reach aspeed of up to 600 micrometers per second."If you come to a spot where you need totake the right path and if you miss it,then you could go back and go to the right one,"says Setti.In future,the researchers want to use other methods to start the drug release,suchas heat or near-infrared light.They also plan to try making microrollers out of materialsthat would break down in the body over a few weeks or months.The team hopes to test the microrollers in animals soon."The rollers need to carryenough cancer drugs,which is why we need to have them in large numbers,"says Setti."But since we can locally take drugs to the right target,we don't need huge dosages量)”28.What can the microrollers be used for?A.Repairing blood cellsB.Delivering drugs.C.Improving blood flow.D.Performing operations.;29.What does Paragraph 2 mainly tell us about the microrollers?A.Their shape.B.Their advantage.C.Their design.D.Theirapplication.:30.What can we learn about the robots from Paragraph 4?A.Their direction can be adjusted.B.They might miss the target cells.C.They might get stuck in the blood.D.Their speed can changeautomatically.;31.What will the scientists probably do next?A.Put the microrollers to clinical use.B.Sell the microrollers in large quantities.C.Tear the microrollers down in the body.D.Experiment with the microrollersfurther.You look up at the sky on a clear and dark night,you'll see more stars than youreyes can count.Most of these stars have planets,similar to our own,orbiting them.第5页共10页