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B.Her best friend Lily refused to play with her.C.She had no one to celebrate the festival with.D.Her best friend Lily did not want to help her.26.The banyan tree could be Mia's brother because of its___A.ageB.roleC.sizeD.power27.What did Mia do after hearing her mother's idea?A.She cleaned her house.B.She went to find her brother.C.She climbed the banyan tree.D.She began to prepare her rakhi.0Researchers have been looking forward to using tiny flying robots to settle important tasks.The machinescould be used to help astronauts on space missions,and even to help bees with plant pollination().However,fitting the heavy electric equlpment that is used to power and control the wings into the tiny robot has beenchallenging.Now here comes a special flying robot-RoboBee X-Wing.It is the world's lightest aerial vehiclethat can fly not tied to a power source.Made by Harvard researchers,the insect-inspired robot weighs only 259 milligrams,has four wings whosedistance is 3.5 centimeters,and stands 6.5 centimeters high.Its four small wings,which can flap()up to170 times a second,are controlled by actuators().Six small solar cells are fitted above the wings toprovlde the power.To test its flying abilities,the team,led by Dr.Noah Jafferis and PhD student Elizabeth Helbling.exposed the RoboBee X-Wing's solar cells to LED lighting.To their delight,the tiny robot's wings beganto flap,and it rose,keeping a flight for about half a second.Though the robot lost its flight ability as soon asthe power source was turned off,its short flight was cheered for its huge effect on the future of tiny flyingrobotsHowever,though the current RoboBee X-Wing is a step in the right direction,it is not quite ready forpractical use.The researchers also hope to experiment with other power sources,such as batteries,sun light orradio frequency signals,and to add more advanced "brains"and sensor systems to help the robot navigate andcomplete tasks independently.28.What is special about RoboBee X-Wing?A.It is for dangerous tasks.B.It can fly for a long timeC.It can fly not tied to a power source.D.It is powered directly by the sunlight.29.How does the writer describe RoboBee X-Wing in Paragraph 2?A.By using figures.B.By giving examples.