SoPC设计时：在FPGA上设计一个软核，比如Altera的NIOS II，Xilinx 的MicroBlaze等；局限在于软核的性能远远不及硬核，而且会占用大量的FPGA资源

Nios II软核处理器的硬件抽象层（HAL）系统库是一个轻量级C/C++运行时环境，属于单线程的类UNIX运行库，关于它所提供的服务如下哪一项说法是错误的（）。

A.结合NewLib ANSI C标准库，向用户提供熟知的标准库函数

B.提供设备驱动，使用户可以访问系统中的所有设备

C.为系统提供了TCP/IP协议栈

D.系统初始化，在main()函数之前完成软核处理器Nios和运行库环境的初始化任务

A、正确

B、错误

A、saltaron

B、saltaban

C、saltó

D、saltaba

A.Arepresentationoftheequation（tps/kbps）*100

B.Thepercentageoftimethedisksareidlewithnoactivity

C.ThepercentageoftimethedisksareidlewithnooutstandingCPUrequests

D.ThepercentageoftimetheCPUisidlewithnooutstandingdiskI/Orequests

A.ThetotalCPUusageforthisdrive

B.Thebandwidthutilizationoftheindicateddrive

C.Itcanbestberepresentedbytheequation（%iowait-%ioidle）

D.Itcanbestberepresentedbytheequation（kilobytesread/kilobyteswritten）*100

A.医用口罩一般分为普通医用口罩、医用外科口罩和医用防护口罩

B.“N95”口罩中的“N”是指不耐油性的颗粒，“95”是指在美国NIOSH标准规定下，过滤效率达到95%

C.口罩建议每2-4小时更换一次

D.使用完毕后，将口罩接触口鼻的一面朝外折好，丢弃于专用垃圾箱内

Single—parent Families

Today we tell about the m ajor change in the American family．It is the increase in the number of families with only one parent．

（1）．One 0f the reasons for this is the increasing number 0f women who have children without being married．The United States Census Bureau recently released a new report 0n the situa tion． 2）．It said 24 percent of them had at least one child．Almost 4 million unmarried women in the United States are mothers．This is an increase of alnIost 60 percent in the past 10 years．

（3）．In the past，women were expected to marry and remain home with their children．They depended on their husbands to earn money to support the fmnily．Experts say women were pushed into marriage by many parts of Anierican society． （4）．

（5）．They say American women have fewer economic reasons for marrying than they did yearn ago．This is because more women work outside the honle today than in the past，and there is less of difference between the earnings of men and women in the United States．Other experts believe there is social and cultural explanation for the increase in unmarried mothers in America．One expla。nation is that the woman’s rights movement gave many women a new feeling of independence．Another explanation is the society is more willing to accept unnmrried mothers than it（1id in the past．Unmarried mothers and their children no longer live in shame．

A．About 22 percent of American children now live with only one parent．

B．Experts have tried to explain the reasons for the increase．

C．The report included women between the ages of 1 8 and 44 who have never been married．

D．Experts say this is not true today．

E．A woman’s family expected her to be married，so did religious groups，customs and laws．

F．There has been nluch debate in the United States about the single-parent family．

第 46 题 请选择（46）处的最佳答案．

A.WTO

B.NIOSH

C.OSHA

D.WHO