第二节根据短文内容,从下面方框中选择适当的选项补全短文。(木题共4小题,每 C Miny enironmental groups are warming that ocans of the world are in great danger. In the 小题2分,共计8分) past 50 years. the number of water with zero oxygen(sf t) in the open ocean has increased more Do you have a tail? Of course not, we know. But tals are like opinions, actually, everyone than four times. In the near coast water bodies, including the nver mouth and seas, low-oxygen has them: fishes, birds, most reptiles, and even some of our closest relatives. areas have inereased more than 10 times since 1950 Since tails first evolved(进化) at east5 00 miilion Scientists discover that oxygen continues dropping even years ago. Geckos(5/4)use them to store fat birds use outside these zones as the Earth warms, To stop the drop. them to steer through the air. But for most mammals (off id is to control in both climate change and 乳动物)62 Yet, as you get closer to humans on nutrient(养分) the evolutionary tree, tails disappear.Gils(大舞猩) Oxygen is a must to lite in the oceans, The drop in don't have them, and neither do chimps(黑猩猩) or any ocean oxygen is among the most serious etfects of human ther apes (/38), including us, of course, To understand why, take a look at how we walk activities on the Earth's environment. This is the first time for the scicntists to take such a deep look at the causes, results and walking like this gives us a huge advantage because unlike four-legged animals, solutions to low oxygen worldwide, in both the open ocean and the near coast waters.About half which have to pour cnergy into every step they take, two legs take advantage of gravity/ 1) of the oxygen on Earth comes from the ocean. However, mixed eftects of nutrient loading and which does some of the work for us. You see, each time we take a step, gravity pulls us forward climate change are greatly increasing the number and size of dead zones" in the open ocean and The end result is that when we walk, we use around 25% less energy than walking on all fours, and the near coast waters, where oxygen is too low to support most sea life this way of getting around also totally climinates (it) the need for a taiL. In the areas traditionally called"dead zones". like those in Chesapeake Bay and the Gulfof It's said that you ean still see a reminder of a time when our ancient ancestors had one. Just Mexico, oxygen drops to levels so low that many animals have trouble in breathing and die. As look at a human spine (H ME). 64 That's your tailbone It's all that's the rest of our tail fishes run away from these zones, their living areas become smaller and smaller. But the problem Now, babies are bom with what looks like a tail, but that's not what's really going on. Most ves far beyond "dead zones". Even smaller oxygen drops can hold up the growth in animals and often, these tails are actually a parasitic twin(a t): These types of tails usually form as a birth lead to disease or even death. Low oxygen ... ...
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