英语专业四级
单选题Just as the value of a telephone network increases with each new phone _____ to the system, so does the value of a computer system increase with each program that turns out.A addingB to have addedC to addD added
题目
adding
to have added
to add
added
参考答案和解析
句意：正如电话网络中每加入一部电话，这个网络的价值就会增加，计算机系统中每添加一个程序，这个系统的价值也会增加。本题使用just as…so的句型，意为“正如…也”。由于已经有了谓语动词increases，所以add只能用其非谓语形式，又因被修饰的名词phone与动词add之间是动宾关系，所以应用add的过去分词，表示被动的含义。
相似问题和答案
第1题：
141 To calculate the expected value of an outcome:
A. divide the value of each outcome by its probability, then add the results.
B. divide the value of the desired outcome by the value all possible outcomes
C. multiply the value of each outcome by its probability, then add the results
D. use linear regression to assess the expected value of the outcome
E. B and D only
第2题：
In most WANs, the network contains numerous cables or telephone lines, each one connecting a pair of
A．hosts
B．routers
C．servers
D．networks
第3题：
The initial cost of a product and the product's operation and maintenance costs _____ .
A . increases perceived value when balanced.
B . are incidental to each other because initial costs are "sunk"
C . decreases design costs as operation periods increase
D . provides perceived function value and product social dysfunction
E . are integrally related with each other because initial costs are "sunk".
第4题：
OSPF is configured over a Frame Relay network as shown in the exhibit. All PVCs are active.However, R1 and R3 fail to see all OSPF routes in their routing tables. The show ip ospf neighbor command executed on R2 shows the state of t he neighbors. What should be done to fix the problem? （）
A. The ip ospf network broadcast command should be configured on each Frame Relay interface
B. The ip ospf network non -broadcast command should be configured on each Frame Relay interface
C. Th e ip ospf priority value on the spoke routers should be set to 0
D. The ip ospf priority value on the hub router should be set to 0
E. The neighbor command should be configured under the OSPF routing process on all routers
第5题：
Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)
A. Inspect the routing table to select the best path to the destination network addresses.
B. Validate sources of routing information.
C. Inspect the ARP table to verify a legitimate source MAC address for each packet.
D. Identify the destination network address of each packet.
E. Verify the receipt of routed packets by the next hop router.
F. Identify the source network address of each packet.
A,D 解析：Explanation:
The router decides how to forward an incoming packet by finding the routes that "match" the destination address of the packet, and then forwarding it according to the most narrowly applicable one.
A packet matches a route in the following way: a packet has (among other things) a destination address in its header, a route contains either a network or a host address, a network mask (netmask), and instructions on how to forward a packet using the route.
The packet matches the route if its destination address is part of the address subspace defined by the network address or exactly matches the host address of the route. A route is more narrowly applicable than another if the address subspace defined by its network address contains fewer actual addresses than the other, which is indicated by the netmask. An entry with a host address, rather than a network address, is the narrowest kind.
第6题：
57 The initial cost of a product and the product's operation and maintenance costs _____ .
A. increases perceived value when balanced.
B. are incidental to each other because initial costs are "sunk"
C. decreases design costs as operation periods increase
D. provides perceived function value and product social dysfunction
E. are integrally related with each other because initial costs are "sunk"
第7题：
A.at once
B.immediately
C.again
D.at that moment
答案：D
解析：本句意思：方才，电话响了，就在那时响了；选项 A B 表示“立刻，马上”常指一个事情紧接着另一件事情发生，不适合本句，因为本句表述的是同一件事情。本句并没表示电话先响过一次，所以也不选C。
第8题：
To calculate the expected value of an outcome:
A divide the value of each outcome by its probability, then add the results.
B divide the value of the desired outcome by the value all possible outcomes
C multiply the value of each outcome by its probability, then add the results
D use linear regression to assess the expected value of the outcome
E B and D only
第9题：
Refer to the exhibit. ROUTE.com has just implemented this EIGRP network. A network administrator came to you for advice while trying to implement load balancing across part of their EIGRP network. If the variance value is configured as 2 on all routers and all o ther metric and K values are configured to their default values, traffic from the Internet to the data center will be load balanced across how many paths? （）
A. 1
B. 2
C. 3
D. 4
E. 5
第10题：
A.With a network wide mask of 255.255.255.128, each interface does not require an IP address.
B.With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.
C.With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.
D.With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.
E.With a network wide mask of 255.255.254.0, each interface does not require an IP address.