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1 Answer: D The clues in this sentence include the word misshapen The cells resemble crescents rather than round discs Choice B might be acceptable if it were resulting in rather than resulting 2 Answer: B Whether you know this de nition or not, it should be easy enough to infer that density equals the number of organisms compared to the size of their habitat Choice A is redundant, and choice D is a synonym for density 3 Answer: C Logical thinking should result in your choosing choice C 4 Answer: A Choices A, B, and C would work for the rst blank, but only choice A ts the second blank Barricade (choice B) would be an odd choice of verb to describe what aspirin does, and you would not want it to enhance pain (choice C) 5 Answer: C Any of the answer choices might work for the rst blank, but only choice C ts the second blank Neither endure (choice A) nor consume (choice D) makes sense in context, and act (choice B) is ungrammatical 6 Answer: D The clue in this sentence is less complex Annelids are more complex than the other worms mentioned; therefore, their systems are not simpler (choice A) but rather welldeveloped (choice D) Choice B has little meaning, and choice C would not support the author s point that annelids are more complex

4 5 6 7 8 9 10

Any object that will be called upon from a different application domain or machine must be built as a remote object This means that it must derive from SystemMarshalByRefObject Any object that derives from MarshalByRefObject is not allowed to transverse application domains A proxy is needed to communicate with objects such as these EXAM TIP The MarshalByRefObject class allows access to objects across application boundaries The application must support remoting Some of the methods of the MarshalByRefObject class include CreateObjRef(), which creates an object that contains all of the information to create the proxy; GetLifetimeService(), which retrieves the object that controls the lifetime policy of the remote object; and InitializeLifetimeService(), which gets a lifetime service object to control the lifetime

To build the remote object, create a new class in Notepad as follows:

using System; namespace HelloWorld { public class Hello: MarshalByRefObject { // constructor for remote object public Hello() { // output to the console a message that indicates // that we are in the constructor of the object SystemConsoleWriteLine ("We are in the constructor"); } // public method that the client will call public string HelloWorld() { // output to the console a message that indicates // that we are in the HelloWorld() method SystemConsoleWriteLine ("We are in the HelloWorld() method"); // return the Hello World string to the caller of the method return "Hello World!"; } } }

1 Car-opening tool sets sold through locksmithing supply houses may include over 20 tools A True 2 B False

Save the file as Hellocs and compile the remote object as follows:

You should find that you have Hellodll in the same folder as Hellocs after a successful compilation In this example, we have created a library class with a single method, HelloWorld() The class inherits from SystemMarshalByRefObject, which supports the class becoming a remote, callable component We have included a few console write lines that will let us see the component moving from constructor to method call these are for demonstration only Notice that the HelloWorld() method does not write out to the console; rather, it returns the string to the caller of the method It is a common mistake of first-time remote-component coders to write to the console instead of returning the string Remember that your calling program will probably not be on the same machine as the remote component, so writing to the console is only useful to the server computer not to the client computer

Our next step is to create the remote server For this example, we will create a simple console application that will instantiate a TCPChannel and register our remote component In Notepad, create the following console application: