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  3. Killing a soldier removes one enemy from the battle. Wounding him removes three: the victim and the two who have to carry him fr

Killing a soldier removes one enemy from the battle. Wounding him removes three: the victim and the two who have to carry him fr

admin2021-04-06  5
问题    Killing a soldier removes one enemy from the battle. Wounding him removes three: the victim and the two who have to carry him from the battlefield. That cynical calculation lies behind the design of many weapons that are intended to incapacitate rather than eliminate. But robotics may change the equation.
   The Battlefield Extraction-Assist Robot, or BEAR for short, is a highly agile and powerful mobile robot capable of lifting and carrying a combat casualty from a hazardous area across uneven terrain. When it is not saving lives, it can perform difficult and repetitive tasks, such as loading and unloading bullets.
   The current prototype BEAR is a small, tracked vehicle with two hydraulic arms and a set of video cameras that provide a view of its surroundings to its operator via a wireless link. It has been developed by TATRC (a research center) in collaboration with Vecna Technologies. Daniel Theobald, BEAR’s inventor and Vecna’s boss, says versatility is at the heart of the robot’s design and "the whole idea from the start was to design a general-purpose robot."
   The BEAR’s operator can control the robot in two ways. One, a joystick, can be embedded into the grip of a rifle and manoeuvred by the soldier’s fingertip when he is holding his weapon to his shoulder. The advantage of this is that he does not need to put his gun down to rescue his comrades. The other means of control, a special glove designed by AnthroTronix, can sense the wearer’s hand movements and direct the BEAR accordingly. For example, if the gloved hand moves to the left, the robot will follow. If the hand moves backwards, the robot will slow down or stop.
   Over the past year BEAR has been tested at the army’s battle laboratory. It has shown that it can travel at around 12 mph across a flat surface. It can also move over soil, sand and gravel, through trees and inside buildings, albeit at lower speeds. Several more years of tests are planned, but Dr. Gilbert is optimistic that BEAR will come through them. If it does, soldiers will be able to get on with their primary job of killing the enemy, without having to worry so much about what the enemy has done to their friends.
   
According to Paragraph 4, what’s the advantage of the joystick?
选项 A、It can be embedded into a gun.
B、It can be operated by the soldier’s fingertip.
C、It can make the soldier rescue his comrades with the gun.
D、It can sense the soldier’s movements.
答案C
解析 细节题。根据题干关键词advantage定位到第四段第三句。此句意为“这样设计的好处是士兵无须丢下枪就可以救他的战友”。由此可知C项“操纵杆可以使士兵带着枪去救他的战友”，符合题意，为正确答案。
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