It’simpolitetospitoutthefirstbiteofyourdinner.But...
问题详情:
It’s impolite to spit out the first bite of your dinner. But to a type of Australian snake, this rude behavior is a matter of life and death.
The snake, called a floodplain death adder(蝰蛇), eats two types of frogs that are hard to stomach. The frogs produce chemicals to defend them from predators(猎食者).
One of these species, the Dahl's frog, can kill a snake that tries to eat it. The other species, the marbled frog, is less dangerous but still tough to eat. When attacked, it produces a glue like substance. Leaves and branches get caught up in this material, making a big sticky mess that gets in the way of anything trying to swallow it. A marbled frog can even get stuck on the head of an attacking snake.
Both frogs have good defense methods. But the floodplain death adder knows how to get around each of them.
Floodplain death adders quickly strike these frogs, using their poisonous teeth to inject poison. But then, instead of swallowing their dinner immediately, the snakes sit back and wait for their preys to become safe to eat. That's because both the Dahl's frog's protective toxin(毒素) and the marbled frog's glue break down over time. After a while, the frog toxin is no longer poisonous and the glue is no longer sticky.
The two substances break down at different rates, and floodplain death adders seem to know the difference, And adder waits for a different length of time depending on the species of frog it just struck.
The stickiness of the marbled frog glue decreased by as much as two-thirds after just 10 minutes. And that's just about how long an adder waits before eating a marbled frog.
On the other hand, the snakes wait for about 40 minutes before eating a Dahl's frog. That's enough time for the frog's toxin to break down into harmless substances.
But even a quick strike gives a taste of the Dahl frog's toxin. After striking such a frog, a floodplain death adder thrashes(翻腾) around and lies on its back with its mouth open, It's like the snake has just had a mouthful of chili pepper.
By comparison, when given frogs that have no chemical defenses, floodplain death adders eat their prey immediately after striking. Snakes, despite the fact that they’ve got this tiny pea-size brain are clearly capable of recognizing what kind of frog they’ve bitten.
1.What’s the best title of the passage?
A.A dangerous meal
B.A snake——floodplain death adder
C.Two types of frogs——Dahl’s Frog and Marbled Frog
D.The method of killing frogs
2.The underlined word “it” in the 3rd paragraph refers to the .
A.marbled frog B.Dahl’s frog
C.floodplain death adder D.glue
3.The glue produced by the marbled frog is used for .
A.sticking the snake’s head
B.making a safe place to live in
C.preventing anything from tying to attack it
D.killing an attacking snake
4.From the passage we can conclude that .
A.the Dahl’s frog carries enough poison to kill a snake but only if the snake eats it immediately
B.the floodplain death adders only eat the Dahl’s frog and Marbled frog
C.although the snakes have tiny pea – size brain , they are cleverer than human beings
D.both the Dahl’s frog and the marbled frog protect themselves by producing toxin
5.What’s the floodplain death adder’s method to make the frogs safe to eat ?
A.They thrash around with their mouths open
B.They sit back and wait for their preys to become safe to eat
C.They inject poison on the preys and wait for the breaking down of their toxin and glue before eating them
D.They quickly strike these frogs
【回答】
AACAC
知识点:阅读理解
题型:未分类
-
一个质量为4kg的物体静止在足够大的光滑水平地面上.从t=0开始,物体受到一个大小和方向周期*变化的水平力F作...
问题详情:一个质量为4kg的物体静止在足够大的光滑水平地面上.从t=0开始,物体受到一个大小和方向周期*变化的水平力F作用,力F的变化规律如图所示.则( )A.t=2s时物体沿负方向运动的位移最大B.t=4s时物体运动的位移达最小值C.每个周期内物体的速度变化为一定值D.从t=0开...
-
如图,形状相同、大小相等的两个小木块放在一起,其俯视图如图所示,则其主视图是( ).
问题详情:如图,形状相同、大小相等的两个小木块放在一起,其俯视图如图所示,则其主视图是( ).【回答】D知识点:三视图题型:选择题...
-
用若干个体积为1的正方体搭成一个几何体,其正视图、侧视图都是如图所示的图形,则这个几何体的最大体积与最小体积的...
问题详情:用若干个体积为1的正方体搭成一个几何体,其正视图、侧视图都是如图所示的图形,则这个几何体的最大体积与最小体积的差是()A.2B.3C.4D.5【回答】解析:由正视图、侧视图可知,此几何体的体积最小时,底层有5个小正方体,上面有2个小正方体,共7个小正方体;体积最大时,底...
-
阅读下面唐诗,完成①―③题。(10分)书边事。张乔调角断清秋,征人倚戍楼。春风对青冢,白日落梁州②。大漠无兵阻...
问题详情:阅读下面唐诗,完成①―③题。(10分)书边事。张乔调角断清秋,征人倚戍楼。春风对青冢,白日落梁州②。大漠无兵阻,穷边有客游。蕃情似此水,长愿向南流。注释①:唐朝自肃宗以后,河西、陇右一带长期为吐蕃所占。此后,因民众起义及吐蕃将领降唐,其地又全归唐朝所有。本...
相关文章
- Steponit,oryouwon’tcompletethegraduationessayintime.If...
- Ifyoufeeldepressed,it’sbesttodosomethingaboutit—depre...
- FiveThingsAmbitiousPeopleNeverSay ◆“Ican’tdothis-it’s...
- —Don’tmakefunoftheblind.Itisimpolite(不礼貌的). —Sorry,Iwon...
- Ifyouwanttowriteamoviescript(脚本)yourselfbutdon’t...
- ---I’dliketointroducemybestfriend toyou,Peter. ---Than...
- ---IstheMP5 ?It’sverybeautiful.---No,itisn’t.It...
- 阅读理解Maybethatsoundsdifficult,orisitexpensive?No!It’seas...
- —Doyouthinkheistheonlypersonforthejob?—I’mnotquitesure...
- FiveThingsAmbitiousPeopleNeverSay ◆“Ican’tdothis—it’s...