[单项选择]It is difficult to accurately predict earthquakes because______.
A. earthquakes may take place anywhere, anytime
B. earthquakes may happen unexpectedly under the sea
C. earthquakes may take place while people are asleep
D. the taking place of earthquakes involves many factors

[单项选择]Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computers ______.
A. Because it is extremely dangerous to conduct such research on an airplane.
B. Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because research scientists have not been to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.

[单项选择]It is difficult to predict what his ________to the result will be.
A. opinion
B. reaction
C. view
D. impression

[单项选择]What did scientists learn about earthquakes at the Rocky Mountain Arsenal
A. They occur at about 4,000 metres below ground level.
B. The injection of water into earthquake faults prevents earthquakes from occurring.
C. They are usually caused by the oil in the faults.
D. Harmful earthquakes earl be possibly prevented by causing small, harmless earthquakes.

[单项选择]The following places were hit by earthquakes except______.
A. Japan
B. Canada
C. Northridge
D. Kobe

[单项选择]（）scientists understand how and why earthquakes happen, forecasts are usually inaccurate.
A. As
B. While
C. For
D. Since

[单项选择]What is said about the earthquakes that happened in China
A. Altogether 1,480,000 people were killed in the earthquakes.
B. In the past, earthquakes happened twice in China.
C. China is within the "ring of fire".
D. In the history, China had two worst earthquakes that took an enormous number of human lives.

[单项选择]Earthquakes in New Zealand do not cause many deaths because of _______.
A. the dormant volcanoes
B. the concrete building materials
C. the small population in many areas
D. the mild magnitude of the earthquakes

[单项选择]The natural ______ like earthquakes and volcanoes that have struck the Philippines this year have left the government in financial trouble.
A. problems
B. accidents
C. troubles
D. disasters

[单项选择]Which of the following statements least accurately describes why firms can coordinate economic activity more efficiently than markets Firms can achieve:（）
A. economies of scope.
B. diversification benefits.
C. economies of scale.

[多项选择]Which two statements accurately describe a broadcast domain?（）
A. Broadcast domains requiere that the participating devices connect to common swithces or hubs
B. Broadcast domains consist of devices reachable by frames addressed to the Layer 2 broadcast address
C. Broadcast domains requiere a gateway device such a router
D. Broadcast domains consist of devices that reside on the same VLAN

[单项选择]Which statement most accurately describes the implementation of a SQL Access Advisor recommendation?（）
A. SQL Access Advisor recommendations are automatically implemented.
B. Individual SQL Access Advisor recommendations can be scheduled for implementation.
C. All SQL Access Advisor recommendations for a specific task must be implemented at the same time.
D. SQL Access Advisor recommendations are automatically scheduled for implementation during the maintenance window.
E. None of the above.

[单项选择]All of the following statements accurately describe process for administering file systems EXCEPT:（）
A. A logical volume must exist prior to running the crfs command to create a file system
B. A file system must be unmounted before it can be removed
C. Defining a file system imposes a structure on a logical volume
D. Removing a file system using rmfs automatically removes the underling logical volume

[多项选择]Which three statements accurately describe layer 2 Ethernet switches?（）
A. Microsegmentation decreases the number of collisions on the network.
B. if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.
C. Spanning Tree Protocol allows switches to automatically share vlan information.
D. In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port.
E. Establishing vlans increases the number of broadcast domains.
F. Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.