题目内容
On the ocean floor _____. However, to bring them to the surface requires expensive equipment and trained people.
A. do some sunken ships lie B. some sunken ships do lie
C. lie some sunken ships D. some sunken ships lie
C
阅读快车系列答案WASHINGTON --- It’s a great achievement that inspires concepts of robots with consciousness and independent minds.
When people or animals get hurt, they can usually compensate for minor injuries and keep limping along, but for robots, even slight damage can make them stumble and fall. However, a recently made robot has demonstrated a new ability: it can heal its own damage.
The new robot, which looks like a splay-legged (弓形腿的), four-footed starfish, can sense injury to itself and adapt. That ability sets the new robot apart from earlier machines. Because the robot can recover from unfamiliar places.
“There is a need for planetary robotic rovers (行星机器探测车) to be able to fix things on their own,” says Josh Bongard, a professor in the Univer
sity of Vermont, who is one of the device’s creator. “Robots on other planets must be able to continue their mission without human help if they are damaged and cannot communicate their problem back to Earth.”
A typical robot functions according to a computer program, but the new robot works differently. First, sensors in its four legs observe the robot’s movements and signals to its built-in computer. From the information it collects, the robot creates its own programs that allow it to adapt to different situations. For example, when the researchers shortened one of the robot’s legs, the smart machine simply adjusted its way of walking—it used three legs instead of four.
The researchers are looking for other places to put the resilient robot to work. One spot is the ocean floor. That dark and dangerous undersea area might be a good choice for a robot that the scientists call the Starfish. “We never officially named the robot, but we usually refer to it as the Starfish, even though a real starfish has five rather than four legs,” says Bongard. “Also, a real starfish is much better than our robot at recovering from injury, because it can actually grow its legs again.” Scientists have created robots that help humans in many ways: by exploring space, fighting fires, and even performing s
urgery.
【小题1】The newly designed robot distinguishes itself from the former ones because it________.
| A．can communicate with people on the earth about their problems |
| B．works according to a certain computer program |
| C．can find its problems and solve them automatically |
| D．can explore unfamiliar places |
| A．is used to create new programs |
| B．has typical robot functions |
| C．has sensors to observe its movements |
| D．can gather information and adapt to new conditions |
| A．It was spoken highly of by people for its special ability. |
| B．It will stumble and fall if damaged. |
| C．It can grow its legs again once they are broken. |
| D．It has started to work on the ocean floor. |
| A．How the Starfish Robot Works |
| B．Do-It-Yourself Robot Repair |
| C．Robots Designed to Work on Other Planets |
| D．New Robot Helping Us in Many Ways |
Due to climate change, Arctic ice is breaking up earlier in the spring, and its area is decreasing. This is creating problems for polar bears that make their homes off northern Alaska and in Hudson Bay.
Polar bears off Alaska normally hunt and raise their young on ice sheets that float on the ocean. But as the ice has melted, the polar bears have been forced to spend more time on land. There, they have begun to frequent beaches, feeding on the remains of whales caught by native hunters. For polar bears, this food is less nutritious than seals that they normally catch on ice sheets. The shrinking（减少） ice has also forced more polar bears into the ocean. In the past, they only had to swim short distances between ice sheets. But as the ice has shrunk, polar bears have been forced to swim longer and longer distances in the open ocean. This poses a severe danger during rough weather, and an increasing number of drowned polar bears have been observed.
In Hudson Bay, the ice breaks up three weeks earlier in the spring now than it did 20 years ago. Polar bears on Hudson Bay fast（绝食） during the summer, waiting for ice to form in the fall to hunt. Every year, the summer gets longer, and the bears get skinnier. Over the past 25 years, the average weight of the female bears has dropped 68 kg. This loss affects their ability to reproduce, and already the number of births has dropped 15 percent. Unless the bears can learn to survive these climate changes, these giants of the ice may one day disappear.
1.What is Arctic ice doing earlier each year?
|
A．It’s freezing. |
B．It’s hardening. |
|
C．It’s melting. |
D．It’s expanding. |
2.What is true of polar bears that are spending more time on land in Alaska?
|
A．Their young are dying. |
|
B．Their diet is changing. |
|
C．Their health is improving. |
|
D．Their families are growing. |
3.What do polar bears in Hudson Bay do during the summer?
|
A．They claim territory(地域). |
B．They protect mates. |
|
C．They hunt animals. |
D．They stop feeding |
4.In which publication would you most likely find this passage?
|
A．Medical News |
B．Society Today |
C．Wildlife Journal |
D．Design Magazine |