首页
登录
职称英语
[originaltext] We’ve now discussed how most snakes move. but there are some
[originaltext] We’ve now discussed how most snakes move. but there are some
游客
2024-02-07
55
管理
问题
We’ve now discussed how most snakes move. but there are some exceptions. One is the snake called the American side-winder. From its name, you can probably guess that it moves sideways rather than in a straight line. This is because it lives in the desert where the sand slips and slides. With nothing firm to push against, the side-winder has had to adapt its way of movement to the shifting sand. It pushes against the sand with the entire side of its body, and then move sideways. Think about how a skier climbs a slope on skies. The skier places the skies at an angle of 90 degrees to the direction of movement. The skier then moves each ski by taking a step to the side up the slope. The side-winder snake moves in much the same manner. It lays its body at about 60-degree angle to the direction in which it wants to go. By doing this, the snake has more sand to push against. Then it points its head in the direction it wants to go and leaps to a parallel spot. If you see the tracks left by the side-winder in loose sand, you’ll see a series of paralleled lines. An advantage gained from this method of moving may be that the snake’s body is kept cooler by breaking off contact with the hot sand during its leaps.
22. What is the main topic of the passage?
23. Why does the side-winder move the way it does?
24. What do the side-winder’s tracks look like?
25. What may be a special advantage of the side-winder’s way of moving?
选项
A、Straight lines.
B、Curving lines.
C、Paralleled lines.
D、Crossing lines.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3430715.html
相关试题推荐
[originaltext]Apopularboyband,theBackstreetBoysisprobablythemost
[originaltext]IfyouwanttoescapefortheValentine’sDayweekendbutdon
[originaltext]Somepessimisticexpertsfeelthattheautomobileisdoomed.
[originaltext]W:Ihaven’tseenyouhereforacoupleofweeks.Haveyoustope
[originaltext]W:Ihaven’tseenyouhereforacoupleofweeks.Haveyoustope
[originaltext]W:Ihaven’tseenyouhereforacoupleofweeks.Haveyoustope
[originaltext]W:I’vebeenreadingaboutanewsnackfood.It’smadefromfish.
[originaltext]W:I’vebeenreadingaboutanewsnackfood.It’smadefromfish.
[originaltext]M:What’sLauradoingheretoday?Ithoughtshewassupposedtob
[originaltext]M:What’sLauradoingheretoday?Ithoughtshewassupposedtob
随机试题
Itisanunderstoodfactthatwaterhelpsmobilizesolublenutrients,transp
DoctorsataDutchhospital【S1】______anewkindofsurgeryonFridaytocorr
Severalyearsago,Ilearnedthataphysicianinatownnottoofarfromwhe
我国职业病防治工作的原则是A.群防群治、全民参加 B.保障经济发展 C.预防
现代西方哲学从思想倾向上可分为两大思潮,它们分别是()A.主观唯心主义 B.客
某企业2020年度销售收入为272000元,发生业务招待费5000元,发生广告费
A.血苯丙氨酸浓度>0.24mmol/L(4mg/dl) B.染色体核型为:4
市场风险对冲的原理在于原风险敞口出现亏损时,新风险敞口能够盈利,盈利能够尽量全部
给定纸盒外表面,下面哪个图形可以和题中图形折成同样的盒子。 AA
额定电压时信号继电器的电流灵敏系数宜不小于()。A.1.2;B.1.3;
最新回复
(
0
)