问题 完形填空
There are times in our lives when we remember. Remembering the good things of __46__   is a most precious (宝贵的) time; these memories are __47__  in the corner of my mind.
When I was four years old, I often went to a kindergarten (幼儿园). I __48__ many toys and friends that made me laugh and cry. The teachers were __49__ and friendly. They taught us many interesting songs and games.
We played all day long. We did not know what learning was at that time, __50__ we were learning every day.
When I was __51__ years old, I started school. I was very __52__ because I became a school student and began to learn school subjects. My favourite subject was __53__. I remember, the first day, our science teacher told us the sun was like a big fire ball and __54__ was very, very far away. Nobody could stay close to that "ball". We were quite surprised and kept our mouths open. We began to wonder at the __55__ of the universe(宇宙). Later on, more ideas __56__ weather, planes, railways, wildlife, deserts and even pollution came to our ears. We began to learn __57__.
When I was about ten years old, I __58__ quite a lot of things. I began to read newspapers, keep a diary, visit museums __59__ make many friends. Every day was something new. Every day was interesting and exciting.
Now I am in the middle school. Each day is new to me. Happily I am still learning, which is like a journey to me. I have finished the first part, but there is still a long __60__ for me to go. I hope I will become a learned person someday.
小题1:
A.the futureB.the past(过去) C.last yearD.next year
小题2:
A.sometimesB.seldomC.neverD.always
小题3:
A.borrowedB.boughtC.hadD.saved
小题4:
A.beautifulB.oldC.kindD.young
小题5:
A.asB.butC.ifD.before
小题6:
A.threeB.sevenC.elevenD.fifteen
小题7:
A.angryB.excitedC.tiredD.worried
小题8:
A.EnglishB.PhysicsC.ScienceD.Maths
小题9:
A.theyB.IC.heD.it
小题10:
A.sizeB.colourC.shapeD.place
小题11:
A.aboutB.toC.withD.for
小题12:
A.quietlyB.carelesslyC.slowlyD.suddenly
小题13:
A.keptB.boughtC.knew D.took
小题14:
A.andB.butC.soD.or
小题15:
A.timeB.tripC.wayD.road
答案

小题1:B

小题2:D

小题3:C

小题4:C

小题5:B

小题6:B

小题7:B

小题8:C

小题9:D

小题10:A

小题11:A

小题12:C

小题13:C

小题14:A

小题15:C

小题1:根据下文的内容,可知答案为B,表示记得过去的事情。

小题2:根据上文的内容,可知答案为D

小题3:根据上下文的意思,可知答案为C,表示拥有很多朋友的意思。

小题4:根据后文内容They taught us many interesting songs and games.,可知答案为C

小题5:根据前后内容关系为转折关系,关系B,表示但是的意思,符合题意。

小题6:根据一般常识,一般上学的年龄为7岁左右,关系B

小题7:根据后文的内容I became a school student and began to learn school subjects.可知答案为B,表示很兴奋的意思。

小题8:根据下文的内容I remember, the first day, our science teacher told us the sun was like a big fire ball可知答案为C,是科学。

小题9:根据上下文的内容可知答案为D,表示上文的球,故用it 代替。

小题10:根据上下文的内容可知答案为A

小题11:根据上下文的内容,可知答案为A,表示关于的意思,符合语境。

小题12:根据上下文的意思可知答案为C,表示慢慢地,开始学习很多的内容。

小题13:根据上文的意思,和阐述的内容,可知,我已经学了很多的东西。故选C,表示知道的意思。

小题14:根据前后文的内容之间的关系为并列关系,故选A

小题15:根据上文的内容Each day is new to me. Happily I am still learning, which is like a journey to me.可知答案为C,表示路还很长的意思。

单项选择题
问答题


阅读以下关于CAN现场总线嵌入式监控系统的技术说明,根据要求回答问题1至问题5。
[说明]
某自动化仪表企业正在研究使用现场总线网络构成自动监测系统的可行性,打算采用 CAN(Controller Area Network,控制器局域网络)总线作为底层网络构件系统。该企业试验用的数据采集与监测系统的网络结构如图6-10所示。


在图6-10网络结构中,系统主控机可有一台或多台,相当于上位机,负责系统的总体管理,可以向网络节点发送命令,接受节点数据,进行存储、分析、统计、显示与打印等工作。在系统主控机内装有PCCAN网卡(CAN总线通信接口适配卡)。系统主控机中具有以下几种软件模块:
(1)初始化模块。该模块用来设置CAN网络通信速率、输出控制方式、报文标识符屏蔽格式等参数,设定各节点工作空间的位置与规模,初始化节点缓冲区域的缓冲文件等。
(2)采集节点信息与数据模块。该模块可以采用指定节点发送、由节点主动发送和自动轮询采集等多种方式,并可以统计与分析数据采集的进度与状态。
(3)向节点发送参数、命令或程序模块。
(4)数据统计分析模块。
(5)系统管理模块。
图6-10所示的网络结构中有12个网络节点,每一节点都通过传感器采集现场的有关数据。在每一节点电路中都配置了MCP2510 CAN控制器和TJA1050总线收发器,其接口电路如图6-11所示。系统主控机与网络节点采用双绞线连接,实验时最大节点间的距离为35 m。

[问题4]
MCP2510和TJA1050连接的两个信号都是单向信号。在图6-11所示的电路图中, MCP2510芯片输入信号即RXCAN高电平的范围Vih是2~4.3 V。这并不能满足5 V逻辑的TJA1050芯片的输出电平,因此需要进行I/O接口电路的电平转换。在图6-1l所示的电路图中,电阻SR10、SR11的阻值在选择时需要考虑哪些因素