unscrewing the bulb during the daylight
switching the light on only when necessary
taking no action as there is no way on saving power
taking no action as they shut off automatically in daylight
第1题：
D
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.
“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.
“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”
His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.
“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”
Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.
71. Which of the following is true of Jae Kwon?
A. He teaches chemistry at MU.
B. He developed a chemical battery.
C. He is working on a nuclear energy source.
D. He made a breakthrough in computer engineering.
细节理解题。根据第三段的叙述可知Kwon在研究一种原子能电池，所以C项正确。
第2题：
Liquid semiconductor is used to _________.
A. get rid of the radioactive waste
B. test the power of nuclear batteries.
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure.
细节理解题。根据By using a liquid semiconductor, we believe we can minimize that problem可知D项正确。
第3题：
A.to it
B.to that
C.to it that
D.to it which
第4题：
The Safety Radio Certificate for the Cargo Ship is issued ______.
A.by the Radiotelegraphy Authority of a country
B.in accordance with the Government Regulations
C.by complying with the Provisions of the National Conventions
D.under the Provisions of the SOLAS Convention
第5题：
Small computers need only small amounts of power, _____ many that they will run on small batteries.
A. which
B. that
C. this
D. what
第6题：
Jae Kwon gave examples in Paragraph 4_________.
A. to show chemical batteries are widely applied.
B. to introduce nuclear batteries can be safely used.
C. to describe a nuclear-powered system.
D. to introduce various energy sources.
细节理解题。根据文章第四段可知Kwon举例的目的是为了说明原子能电池是安全的，所以B项正确。
第7题：
A、universal
B、indlusive
C、indefinite
D、conventional
答案：D
解析：句意：相较于传统的储蓄电池，细小的原子电池具有明显的优势。本题主要考查的是对于学生的词汇量。universal意为普遍的，全球的；indlusive意为范围广泛的，包含在内的；indefinite意为无限期的，不明确的；conventional意为传统的。因此根据句意，本题应选择A。
第8题：
Can we use this material for the decoration of the exhibition hall?
A.Yes. Any available material will do for this job
B.Yes. Water-proof material for the decoration of the hall will be used for the interior decoration
C.No. Fire-proof materials should be used for the interior decoration
D.No. Only highly-cost materials should be used for the interior decoration
第9题：
All of the followings are the detainable deficiencies under the SOLAS Convention except ______.
A.failure of proper operation of propulsion and other essential machinery, as well as electrical installation
B.failure of the proper operation of the main and auxiliary steering gear
C.failure of engineering watch arrangements to conform to the requirements specified for the ship by Administration
D.failure of the proper operation of emergency generator, lighting, batteries and switches
第10题：
In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by ______.
A.unscrewing the bulb during the daylight
B.switching the light on only when necessary
C.taking no action as there is no way on saving power
D.taking no action as they shut off automatically in daylight