Passage Three
All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood.
Coal, oil, natural gas, and all other fuels are stored-up energy from the sun. Some was collect ed by this season’s plants as carbon compounds. Some was stored by plants and trees ages ago.
Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power.
Light transmits only the energy that comes from the sun’ s outer layers, and much of this energy that is directed toward the earth never arrives. About nine-tenths of it is absorbed by the atmosphere of the earth. In fact; the earth itself gets only one half-billionth of the sun’ s entire output of radiant energy.

A:directly from the sun B:from the sun' s activity C:from energy stored by the sun D:from radiation of the sun

Passage Three All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood. Coal, oil, natural gas, and all other fuels are stored-up energy from the sun. Some was collect ed by this season’s plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun’ s outer layers, and much of this energy that is directed toward the earth never arrives. About nine-tenths of it is absorbed by the atmosphere of the earth. In fact; the earth itself gets only one half-billionth of the sun’ s entire output of radiant energy.

A:directly from the sun B:from the sun' s activity C:from energy stored by the sun D:from radiation of the sun

Which of the following is not true of the sun spots

A:They are caused by the magnetic pull from inside the sun. B:They are areas of high- level magnetism. C:They are actually black holes in the sun. D:They reach their peak in a cycle of 11 years.

在现代计算机系统中，根据CPU指令组设计的风格，把计算机区分为CISC和RiSC两类。CISC计算机，指复杂指令组计算机，RISC计算机，指精简指令组计算机，下列属于CISC微处理器的是( )。

A:Sun Sparc B:Pentium C:MIPS D:Power PC

在现代计算机系统中，根据CPU指令组设计的风格，把计算机区分为CISC和RiSC两类。CISC计算机，指复杂指令组计算机，RISC计算机，指精简指令组计算机，下列属于CISC微处理器的是( )。

A:Sun Sparc B:Pentium C:MIPS D:Power PC

在现代计算机系统中，根据CPU指令组设计的风格，把计算机区分为CISC和RiSC两类。CISC计算机，指复杂指令组计算机，RISC计算机，指精简指令组计算机，下列属于CISC微处理器的是( )。

A:Sun Sparc B:Pentium C:MIPS D:Power PC

在现代计算机系统中，根据CPU指令组设计的风格，把计算机区分为CISC和RiSC两类。CISC计算机，指复杂指令组计算机，RISC计算机，指精简指令组计算机，下列属于CISC微处理器的是( )。

A:Sun Sparc B:Pentium C:MIPS D:Power PC