下面四幅图是表示地球演变过程中海陆分布的变化情况,根据大陆漂移的假说,由早到晚的排列顺序是
A.③④②①
B.①③②④
C.①②③④
D.①②④③
答案:D
Applications put computers to praticalbusiness (1), but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store(3).A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time.
The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail.
5()
A.abort
B.about
C.above
D.around
北京申办2008年奥运会的主题是什么?有何含义?