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听力原文: OK, can anyone answer this question? What are the most important things for animals in terms of their survival? Anyone? No? OK. Well, on a very basic level, the most important things for them are the same as the most important things for the average real estate agent: location, location, and location. That was a little bit of a ... uh ... joke, but there is also a lot of truth to it. Let me explain. Look, imagine you have a small area with a lot of different types of monkeys all living there. Thats a good example, actually, because trade between Diana and putty-nosed monkeys is the topic for today. The monkeys will arrange themselves into groups according to species. All the A monkeys are together and so are all the B monkeys. This allows them to work together to get food and protect themselves. But, the area is small, and this puts all of the groups into competition for food and space, which are both in limited supply. So, where each group is in that space is really important, because its related to how much food it can collect and how safe it will be. See what I mean? The most important things are location, location, and location. Right. Lets look specifically at the putty-nosed and Diana monkeys that live in a small area in the rainforests along the Ivory Coast in West Africa. They live in the same area and have a serious problem: both of them eat vegetation found high up in trees. This situation should make for a lot of small 'wars' between the groups. They are both in the same spot and they both want the same thing. What do they do? Well, with other monkeys, the Diana monkeys tend to establish borders. Basically, after a certain amount of fighting, the two groups stake out and patrol a group of trees for themselves. The advantage is that once these borders are established, everyone can spend their time finding food. Please dont think that the little countries dont allow some 'immigrants.' The Diana monkeys, for example, dont care about Campbell monkeys. They let them into their protected areas all the time. Why? Well, like I said, the Diana monkeys look for food high up in the trees, while the Campbell monkeys tend to forage for food closer to the forest floor. There is no competition between the groups, so there is no fighting. What about the putty-nosed monkeys? Lets review what we know. Diana monkeys will make borders with other groups that compete for the same food in the same area. But, the borders they make are porous; any group that eats a different type of food can cross into the Diana monkeys territory. What about our friends the putty-nosed? Well, I imagine youre all expecting some sort of answer like: they fight with the Diana monkeys. Well, youre wrong. There is no fighting between the two groups and no borders are established. Why? Its sort of the price they willingly pay for the service the putty-nosed monkeys provide. You could call it 'rainforest economics.' Between the two groups, a situation has developed where both groups are willing to give something they have in exchange for something they want. Look, when not worrying about other groups of monkeys, the Diana monkeys spend a lot of time trying to protect themselves from eagles by running away. Heres an important fact, though: Diana monkeys are not very good at knowing when to run. They have a hard time noticing the eagles, which can fly really quickly and silently. Putty-nosed monkeys, on the other hand, are really good at eagle detection. With better hearing and sight, they act like early warning radar. As soon as an eagle comes close, a putty-nosed monkey will let out a shrill yell that is heard and then repeated by other monkeys in its group. The Diana monkeys all run away to safety, with the putty-nosed monkeys staying where they are; eagles cannot eat the larger, stronger putty-nosed monkeys. There is no fighting between the two groups and no borders are established. Why? Its sort of the price they willingly pay for the service the putty-nosed monkeys provide. You could call it 'rainforest economics.' Between the two groups, a situation has developed where both groups are willing to give something they have in exchange for something they want. Why does the professor say this: You could call it 'rainforest economics.' What is the lecture mainly about?
A.
Real estate prices.
B.
Campbell monkeys' eating habits.
C.
The interactions of various species.
D.
The relationship between Diana and putty-nosed monkeys.
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【判断题】数控系统的脉冲当量越小,插补运动的实际轨迹就越接近理想轨迹,加工精度也就越高。
A.
正确
B.
错误
【单选题】( )是从河床纵断面陡坡或悬崖处倾泻下来的水流,具有形、声、色和动态的景观特点,体现水的力量与柔美。
A.
河流
B.
溪涧
C.
瀑布
D.
喷泉
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A.
正确
B.
错误
【判断题】瀑布是从河床纵断面陡坡或悬崖处倾泻下来的水流,具有形、声、色和动态的景观特点,体现水的力量与柔美。
A.
正确
B.
错误
【单选题】物料间的照明白炽灯不准使用大功率灯泡,应在:
A.
lOOW以下
B.
60W以下
C.
40W以下
D.
15W以下
【多选题】瀑布具有( )的景观特点。
A.
B.
C.
动态
D.
E.
【单选题】关于铁剂的叙述错误的是
A.
维生素C可促进铁吸收
B.
Fe3+比Fe2+更易吸收
C.
多钙、高磷酸盐食物可妨碍铁吸收
D.
食物中的铁主要在十二指肠和空肠上段吸收
E.
主要以Fe2+发挥药效
【单选题】物料间的照明白炽灯不准使用大功率灯泡,应在 。
A.
100W以下
B.
60W以下
C.
40W以下
【判断题】采用非均匀量化是为了解决均匀量化时的小信号量化误差过大问题。( )
A.
正确
B.
错误
【判断题】从河床横断面陡坡或悬崖处倾泻而下的水流称为瀑布,具有形、声以及动态的景观特点。( )
A.
正确
B.
错误
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