单项选择题

If x+y=16, and if x2-y2=48, then x-y=（）

A. 3
B. 4
C. 6
D. 32
E. 36

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In many Western European nations, the law is seen as rigid and not open to interpretation. This rigidity grants a consistency to questions of law that many would argue is absent in other, more flexible systems. The European construction of law provides litigants with a clear picture of how a case will be decided. All parties involved are certain how judges will rule on issues. It is simple--judges will strictly follow the law. This simple fact, that the law will not change from one situation to another, allows for court systems in Western Europe to process cases efficiently and cuts down on the amount of frivolous lawsuits. It is useless for an individual to attempt a case if he knows in advance that the law is not in his favor.（）

A．arguing for a universal application of Western European legal practices
B．decrying the rigidity and constancy of Western European legal practices
C．describing the potential benefits of Western European legal systems
D．defining the pros and cons of various legal systems
E．denouncing European law for its anti-consumer bias
单项选择题
Researchers at the Shimizu Institute in Japan believe it is possible to terraform Mars by making use of the planet’s own resources and by introducing genetically altered life from Earth. They hope these actions will speed up the terraforming process, not just by adapting Mars to support Earth-life, but also by adapting Earthlife to exist on Mars. These experts think they can use the Martian geology itself to jump-start the planet. The theory is that detonation of thermonuclear devices deep in the Martian mountains will trigger eruptions of hot magma that would melt the frozen atmosphere, thereby releasing the components necessary for life.（）

A．Martian mountains are well-situated and easily accessible by remote mobility devices.
B．Similar eruptions of magma on Earth have demonstrated the ability to enable life in hostile underwater environments.
C．Mars’ frozen atmosphere lacks the critical components necessary for life.
D．Even if scientists could terraform Mars, the planet would eventually have all the same problems as Earth.
E．Thermonuclear devices would be very dangerous to send to Mars.
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