Passage Three
【听力原文】
[32]We've just discussed how most snakes move,but there are some notable exceptions. One is the snake called the"American side-winder". From its name, you can probably guess that itmoves sideways rather than in a straight line. This is because it lives in thedesert where the sand slips and slides. [33] With nothing firm to push againstfor traction, the side-winder has had to adapt its way of movement to theshifting sand. It pushes against the sand with the entire side of its body, andthen move sideways or sidesteps. Think about how a skier climbs a slope onskies. The skier places the skies at an angle of approximately 90 degrees tothe direction of movement. The skier then moves each ski by taking a step tothe side up the slope. The side-winder snake moves in much the same manner. Itlays its body at about 60 degree angle to the direction in which it wants togo. By doing this, the snake has more sand to push against. Then it points itshead in the direction it wants to go and leaps to a parallel spot. Contractionsdown the length of the snake's body three the remainder of the body to follow.[34] If you see the tracks left by a side-winder in loose sand, you'll see aseries of paralleled lines. [35] An added advantage gained from this method ofmoving may be that the snake's body is kept cooler by the breaking of contactwith the hot sand during its leaps.
32. What is the main topic of the talk'?
33. Why does the side-winder move the wayit does?
34. What do the side-winder's tracks looklike?
35. What may be a special advantage of theside-winder's method of moving?
【整体预测】
快速浏览各题选项，根据其中的关键词sand、animals、desert、snake、way of movingenemies、lines、itself等推测，本文很可能与沙漠中动物的生活习性有关，需重点关注与蛇、移动路线有关的信息。
32.C
【解题思路】
1.四项均为名词性短语，且相互之间关联度不高。
2.两项含有与沙漠有关的词汇(sand，desert)。
结论：本题可能考查短文的主旨。
【解析】讲话者在开头处就提到：“刚刚我们已经讲了大多数蛇的移动方式，但是还有一些明显的特例American side.winder(北美斜行蛇)就是其中的一种。”接下来，讲话者详细介绍了这种蛇的移动方式故选C。
33.B
【解题思路】四项均为以to开头的不定式短语，而不定式短语通常可以表示目的。因此本题很可能考查某种做法的目的是什么。
【解析】题干问这种斜行蛇为什么要这样移动，短文中提到：“With nothing firm to push against for traction.the side—winder has had to adapt its way of movemtent to theshifting sand.(由于找不到坚硬的东西来提供支撑摩擦力，斜行蛇只能使其移动的方式适应松软的细沙环境。)”接着，讲话者将这种蛇的移动方式与滑雪者的行进路线进行了类比，故选B。
34.D
【解题思路】
1.四项均以lines结尾。
2.修饰lines的均为表示形状的形容词(wavy，circular，perpendicular，parallel)。
结论：本题可能考查这种蛇移动路线的具体形状，需重点关注与lines有关的内容。
【解析】短文中明确提到，如果你观察斜行蛇在细沙中留下的痕迹，就会发现它的行迹是平行线的形状，故选D。其他三项wavy(波浪形)、circular(圆形)、perpendicular(垂直线形)均未提及，可以排除
35.A
【解题思路】
1.四项均为名词短语。
2.三项以比较级开头(lower，greater，wider)。
3.四项均含有与动物的生理状态有关的词或短语(body temperatures.energy consumption，conceal itself vsion)。
结论：本题可能考查斜行蛇特殊的移动方式对于其在沙漠中的生存有什么好处
【解析】讲话者在结尾处指出，这种移动方式在行进的过程中有短时离开地面的对候，因此能够使斜行蛇在灼热的沙漠里保持较低的体温，故选A。
Section C
【听力原文】
The northern Italian city of Milan bannedall traffic from its streets for 10hours on Sunday in an attempt to reducesmog.
The measure which was first[36] imposed ona trial basis in the year 2007 is triggered whenever pollution[37 ] exceeds thestatutory limit for 12 consecutive days.
Satellite [38] imgery shows Milan to be oneof the most polluted cities in Europe. An [39] estimated 120,000 vehicles willbe affected by the move, according to the major daily newspaper in the city.
The most polluting [40] vehicles have beenbanned from driving through the city center since Thursday. But on Sunday,there was supposed to be no traffic between 8:00 and 18:00.
The ban is imposed when pollution exceeds50 [41] micrograms of particulates per [42] cubic meter of air over 12 days.The last time the full ban was in force was in February.
The move is not popular with all [431environmentalists, who argue that [441 the city's public transport systemshould be improved to discourage people from using their ears. Local GreenParty councilor Enrico Fedrighini said [45] cars with three or four peopleinside should be offered free parking, for example. "One or two car-freeSundays each month will not do anything to tackle the smog crisis," hetold the daily newspaper in the city.
Public transport was to be bolstered duringthe day, [46] with an extra metro trains and buses operating.
36.impose实行，实施40.vehicle车辆
37.exceed超过41.microgram微克
38.imagery图像42.Cubic立方的
39.estimate估计，估算43.environmentalist环境学家
