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2671.The boat rocked up and down in
發(fā)布:2024/5/23 20:38:36組卷:3引用:2難度:0.62672.The last thirty years _____ the greatest number of laws stopping our rights and progress.Until today we have reached a stage _____ we have almost no rights at all.( ?。?/h2>
發(fā)布:2024/5/23 20:38:36組卷:69引用:6難度:0.82673.To shorten the distance between students and classical drama,a drama festival is organized
發(fā)布:2024/5/23 20:38:36組卷:3引用:2難度:0.92674.water/limited
發(fā)布:2024/5/23 20:38:36組卷:0引用:1難度:0.72675.令人驚訝的周邊風(fēng)景
發(fā)布:2024/5/23 20:38:36組卷:0引用:2難度:0.72676.The remora(鯽魚) is an unusual fish.It hitchhikes on other sea creatures,using a sucker on its head.So you can see them on whales,dolphins,sharks,turtles.They stick to scuba divers,boats,other fishes and remoras.
Brooke Flammang is a biomechanist at the New Jersey Institute of Technology and Rutgers University.She says sticking to other animals is a pretty good strategy. "They avoid predation by sticking to large animals-no one's going to attack you if you're on a shark.Many of them pick parasites(寄生蟲) off the host they're attached to,eat bits of food that are flying by,and poop.And they also have the ability to potentially meet other remoras for mating on the same organism."
But now her team has discovered that the fish have another unusual quality:they're sensitive to touch-a type of touch previously unknown in the fish world. "Up until now we haven't accept the fact that the fish have the ability to sense touch in this way,or to sense dragging and shear,which is going to be very important for a remora,which is attached to something moving very quickly."
By examining the fish's suckers,and looking at the tissue with electron microscopes and CT scans,they saw an unusual push-button-like structure,which they thought must be a type of mechanoreceptor(觸覺感受),enabling a sense of touch.
"We just started studying the literature,trying to figure out what we were even looking at,and the things that have the same structure,a pushrod mechanoreceptor,are monotremes:platypuses and echidnas. " The details are in the journal Royal Society Open Science.
The study suggests that this sort of touch perception arose independently at least twice in the animal kingdom:in remoras and monotremes.And the real story here is that we just need to look for different sensory capacities in organisms to a much larger extent because there are a lot of ways that life forms have come up with to make a living.
(1)What makes the remora different from other fish?
A.It swims with other sea creatures.
B.It sticks to its host in the sea.
C.It has many suckers on its head.
D.It can attack and kill a shark.
(2)What does the underlined word" predation" in Paragraph 2 refer to?
A.Being eaten.
B.Swimming itself.
C.Being attached.
D.Attaining food.
(3)What's the function of the push-button-like structure?
A.It helps the remora to swim quickly.
B.It can catch and kill parasites for food.
C.It enables a sense of touch.
D.It can attach the fish to other animals.
(4)Where is this text most likely from?
A.A diary.
B.A guidebook.
C.A fiction.
D.A science report.發(fā)布:2024/5/23 20:38:36組卷:8引用:1難度:0.52677.He was
發(fā)布:2024/5/23 20:38:36組卷:1引用:1難度:0.72678.Because of work,school or family responsibilities,many people have no time to take an extended vacation. (1)
A mini vacation is a one to three days' getaway.Unlike the standard vacation,it doesn't require weeks of planning and needn't cost much.(2)
Quite often,a mini vacation is scheduled around an official holiday or school break,in order to avoid taking too many personal days off from work or having to pull children out of classes.A typical long weekend could start after work or school on Friday and end the night before a regular schedule comes again.Time is really limited.(3)
An overnight trip to an amusement park nearly could be considered a mini vacation.It has advantages.People can enjoy an inexpensive vacation from the stresses of work or school.(4)
(5)
A.Stop at any scenic spot that looks interesting.
B.A mini vacation generally calls for less money.
C.But it will still provide the same basic content of any trip.
D.A mini vacation is also sometimes annoying to prepare for.
E.So people usually look for destinations within a few hours of their homes.
F.Besides,they are still able to drive back home for emergencies if necessary.
G.Others may have the time,but not have the money to travel for a week or longer.發(fā)布:2024/5/23 20:38:36組卷:7引用:2難度:0.52679.
發(fā)布:2024/5/23 20:38:36組卷:5引用:2難度:0.72680.
發(fā)布:2024/5/23 20:38:36組卷:1引用:1難度:0.9