的右焦点为
，点
在
上，且
轴．的方程；
的直线与交于
两点，
为线段
的中点，直线
交直线
于点
，证明：
轴． NOTICE
Dear fellow students,Student Union
How We Talk about Fear Matters
Lately, there seems to be plenty to fear in the world. How we talk about what we fear might offer clues to how we perceive that emotion socially and culturally.
Get the root of fear.
Figure out the emotional meaning of fear.
Whether emotions are viewed positively or negatively varies from culture to culture.
Find out a fearful pattern.
In looking at such patterns across the major language families, researchers found that the word “fear” was often associated with anxiety, envy and grief in Indo-European languages. But in Austronesian languages, “fear” more often was associated with surprise.
How we talk about fear changes how we react to it. When we talk about what frightens us, it may be useful to disrupt associated meanings. In addition, how our language categorizes an emotion seems to impact whether we perceive those emotions negatively or positively.
In conclusion, fear is something that can be changed by cultural and linguistic experience.
| A．Talk more about fears |
| B．Change our perception of fear |
| C．The word fear has a long history in English |
| D．There seemed a fearful pattern across the major language families |
| E．This is based on what people have learned to associate with emotion words |
| F．It opens the door to potential ways to change how we talk about and react to it |
| G．This makes speakers of the latter languages associate this emotion with a less negative sense |
| A．what | B．where | C．which | D．whether |
| A．conserved | B．preserved | C．reserved | D．deserved |
| A．facilitate | B．complicate |
| C．compensate | D．conserve |
For the sake of surviving in the world with challenges, we need to be wise.
Sometimes we ourselves need to be open to diverse perspectives.
You obviously want to grow and do better in life, right? The best way is to have wise people as your mentors (导师), like teachers, colleagues and even special friends. Prior to making them a mentor, find out what makes them wiser, then engage in useful dialogue with them.
If you have accumulated a lot of knowledge, then why not share it with others too? Communicating with others and helping them out will also increase your wisdom.
| A．This will open up new pathways for us. |
| B．And wisdom is crucial in this modern world. |
| C．Change your routine and see where life takes you. |
| D．What’s more, we need communicate with wise people. |
| E．You must be the kind of person who learns something new every day. |
| F．In today’s world, it is very easy to become wise but it isn’t easy to help others. |
| G．The more time is spent with them, the more transfer of knowledge there will be. |
A humanoid robot can relay video and touch sensations to a person wearing a haptic (触觉内) feedback suit and a virtual reality (VR) headset hundreds of kilometres away, offering away for people to attend events without travelling.
The iCub 3 robot is a 52-kilogram, 125-centimetre-tall robot with 54 joints across its body. Its head contains two cameras where a human’s eyes would be, and an Internet-connected computer where the brain would go. Along with the cameras, sensors covering its body send data to the robot’s “brain”. These sensations are then reproduced on a suit and VR headset worn by a remote human operator.
When the operators react to what they see and feel, the suit’s sensors pick up the movements and the robot matches them. “The key is to translate every signal and bit of digital data that can be sent through the network.” says Stefano Dafarra, who was part of the iCub3 team. There can be a small delay of up to 100 milliseconds to capture and transmit the visual shots, but the operator can case this by moving slightly slower than normal.
The team demonstrated the robot at the Venice Biennale, where it wandered through an exhibition while its operator stood 290 kilometres away in Genoa. Dafarra hopes people will use the iCub3 to attend events remotely, reducing the need to travel. “But at present, a fall could be hugely damaging to the robot, and it’s uncertain whether it could stand up again on its own," he says.
“iCub3 is an interesting robot and offers clear advantages from the previous versions.” says Jonathan Aitken, whose laboratory owns a prior version of the robot. However, he is disappointed that the team wasn’t clear in its research about the data transmission requirements of the new version of the robot. “It would be good to know just how much data was required, and what the upper and lower bounds were.” he says.
1．What’s the principle behind the humanoid robot?| A．It conveys sensations to the wearer and acts accordingly. |
| B．It receives commands from an operator through the Internet. |
| C．The cameras take pictures and then interact with the sensors. |
| D．The computer in the robot processes the data and gives orders. |
| A．Medical consultation. | B．Sports events. |
| C．Outdoor workouts. | D．Virtual tourism. |
| A．It fails to appeal to potential investors. |
| B．Its performance hasn’t been evaluated clearly. |
| C．Its present version still requires to be updated. |
| D．Its transmission of data came across technical problems. |
| A．Humanoid robots with sense of touch catch on |
| B．iCub 3 robot combines with VR to benefit more people |
| C．Humanoid robots let people see and feel things remotely |
| D．New advances in technology enable people to travel at work |
处由静止释放，金属杆下落高度小于h时开始匀速。已知
，PQ与
足够长，金属杆下落过程中始终与导轨垂直且接触良好，不计导轨和导线的电阻，
，不计一切阻力，重力加速度为g。求：
；
时的加速度的大小；后继续下落高度h（在此之前已再次达到稳定速度）所用的时间
。
的A点以沿y轴正方向、大小为
的初速度开始运动，然后从O点射入场，最后从P点离开磁场区域。
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