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A.The general treatment without tickets did not work.B.The "nature therapy"has long been used in CanadaC.Canadian doctors are not doing as well as those in the US.D.The programme has pushed Canadian doctors a step forward.27.Which of the following is a suitable title for the text?A.A Study Reveals the Good Naturc DoesB.Doctors Order a Walk in the WildernessC.Researchers Find a Cure for Mental DiseasesD.A Health Programme Boosts Nature ReservesCNow.a new study has uncovered a simple physical rule that governs ant rafts)shrink and expand.The discovery could one day lead to the design of robotsthat work in groups.Individually,anrs are not as smart as people think,but collectively,they can formvery smart and flexible organizations.For example,after storms in the southeasternUnited States,fire ants form giant floating rafts to survive rough waters.Researchers used mathematical models to work out the mechanics behind thesefloating rafts.They found that the faster the ants on a raft moved,the more the raftexpanded outwards,often forming long stretches.This behavior is automatic in natureand does not require any central decision making.The researchers also conducted experiments to uncover the sccrets of the ant raft.They put thousands of fire ants in a bucket of water with a plastic stick in the middle,and they waited.What they eventually saw was that rafts started to form,and instead of thesestructures staying the same shape over time,they kept shrinking and expanding untilthey formed dense colonies.Sometimes the ants spread out like pancake batteron a frying pan,and sometimes they shrank to form bridges.Each ant raft wasmade up of two layers.At the bottom,structural ants stuck together to form a base.Above them was a second layer of ants,which were free to walk on top of other ants.