136. All of the following statements are TRUE, EXCEPT ...
A) The deep sea begins from 200 metres below sea-level.
B) There aren’t any fish at the bottom of the deep ocean.
C) Before 1960, nobody had been to the bottom of Marianas Trench.
D) There is more pressure below sea-level than on the surface.
Read the text and answer the questions according to it.
Scientists tell us that some birds are clever. The birds use tools to get food. In one study, scientists observed crows. The scientists wanted to see if the crows could solve a simple problem. The problem was how to get some food out of a container. Inside the container, the food floated on the surface of some water. But the birds couldn’t put their heads inside the container to get the food. The container was too narrow. The scientists put some different heavy objects near the container. The birds took the objects and put them into the water. As a result, the level of the water rose inside the container and the birds took the food. In Japan, crows have found a clever way to open nuts. The birds take the nuts from a tree. Then they put the nuts on the road, near traffic lights. When the lights turn green, the cars go over the nuts, breaking them. When the lights turn red, the traffic stops. The crows can go down and pick up the broken nuts.
137. What is the passage mainly about?
A) about clever birds
B) about food containers
C) about heavy objects
D) about traffic accidents
138. According to the passage, why did the crows put heavy objects into the water?
A) in order to take nuts from trees
B) so as to raise water level in the river
C) so as to take food from the container
D) in order to put the nuts on the road
139. According to the passage, what way do the crows use to open nuts in Japan?
A) They pick up nuts out of cars.
B) They put the nuts on the road.
C) They break nuts with their beaks.
D) They take food from containers.
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