Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question. If you go back far enough, everything lived in the sea. At various points in evolutionary history, enterprising individuals within many different animal groups moved out onto the land, sometimes even to the most parched deserts, taking their own private seawater with them in blood and cellular fluids. In addition to the reptiles, birds, mammals and insects which we see all...
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Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question.
If you go back far enough, everything lived in the sea. At various points in evolutionary history, enterprising individuals within many different animal groups moved out onto the land, sometimes even to the most parched deserts, taking their own private seawater with them in blood and cellular fluids. In addition to the reptiles, birds, mammals and insects which we see all around us, other groups that have succeeded out of water include scorpions, snails, crustaceans such as woodlice and land crabs, millipedes and centipedes, spiders and various worms. And we mustn't forget the plants, without whose prior invasion of the land, none of the other migrations could have happened.
Moving from water to land involved a major redesign of every aspect of life, including breathing and reproduction. Nevertheless, a good number of thoroughgoing land animals later turned around, abandoned their hard-earned terrestrial re-tooling, and returned to the water again. Seals have only gone part way back. They show us what the intermediates might have been like, on the way to extreme cases such as whales and dugongs. Whales [including the small whales we call dolphins] and dugongs, with their close cousins, the manatees, ceased to be land creatures altogether and reverted to the full marine habits of their remote ancestors. They don't even come ashore to breed. They do, however, still breathe air, having never developed anything equivalent to the gills of their earlier marine incarnation. Turtles went back to the sea a very long time ago and, like all vertebrate returnees to the water, they breathe air. However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.
There is evidence that all modern turtles are descended from a terrestrial ancestor which lived before most of the dinosaurs. There are two key fossils called Proganochelys quenstedti and Palaeochersis talampayensis dating from early dinosaur times, which appear to be close to the ancestry of all modern turtles and tortoise. You might wonder how we can tell whether fossil animals lived in land or in water, especially if only fragments are found. Sometimes it's obvious. lchthyosaurs were reptilian contemporaries of the dinosaurs, with fins and streamlined bodies. The fossils look like dolphins and they surely lived like dolphins, in the water. With turtles it is a little less obvious. One way to tell is by
measuring the bones of their forelimbs.
According to the first paragraph, reptiles, birds, mammals and insects__________
A. were the ones living on the marine organisms.
B. moved to deserts to find feeding grounds.
C. left the water at the same time of scorpions, snails and crustaceans.
D. are the species whose ancestors succeeded in moving from water to land.
Enviroments is something new(13)_____many people because they simply think that it is te place they are living. Actually it is everything around us, including the sea, land, air with all the creatures and so on. Anything we can imagine may belong to the environment. Therefore, people may feel shocked (14)_____they learn that we are polluting the environment at the moment we are breathing out. It doesn't(15)____that in order to keep the environment clean and unpolluted, we have to stop breathing.Of course, it is(16)____.What we really need to understand is that our activities all affect the environment and we should have little impact on the environment. We never know (17)____we are doing right or wrong to the environment until disasters happen.We have learned many lessons from our wrong doings, However, some could not be repaired because the damage was so great. It is time we(18)___that we are only a part of the environment, not the boss.
13. A.to B. with C.for D. about
14. A.although B. when C. so D.before
15. A. speak B.mean C. say D.tell
16. A. possible B.possibly C. impossible D. impossibly
17. A. unless B. because C. what D. whether
18. A.should realize B. to realize C. realizing D. realizied
13A 14B 15B 16C 17D 18D