Final answer:
In programming, it's generally true that a block of statements can replace a single statement within control structures. Blocks allow for the execution of multiple instructions where one instruction would have been used, providing complex logic and condition-based operations.
Step-by-step explanation:
The statement 'A block of statements may be used anywhere a single statement is expected' is generally true in the context of programming. In programming, control structures such as 'if', 'while', and 'for' can encompass blocks of statements to specify complex logic. These structures offer a way to execute multiple statements in sequence where a single statement could also be used. For instance, a simple if statement can be written to include multiple lines of code within braces ({ }) to form a block. This kind of logic structure is necessary for creating programs that perform various tasks based on specific conditions.
However, it is possible that different programming languages have their own syntax rules which may affect how blocks of statements are constructed and used. So while the statement is generally true, there can be exceptions based on the specific rules of a programming language.