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| Section | Objectives |
|---|---|
| Operating Systems & Architecture | - OS Fundamentals
|
| Computer Science Fundamentals | - Core CS Concepts
|
| Programming Foundations | - Language Concepts Overview
|
| Data & Security Basics | - Data Handling
|
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質問 # 33
What will the expression fam[3:6] return?
正解：A
解説：
Python slicing follows the rule `sequence[start:stop]`, where the `start` index is **inclusive** and the `stop` index is **exclusive**. This convention is taught widely because it makes many algorithms and boundary cases simpler: the length of the slice is `stop - start` (when step is 1), and adjacent slices can partition a sequence without overlap. For a list named `fam`, the slice `fam[3:6]` starts at index 3 and includes the elements at indices 3, 4, and 5, but it stops before index 6.
This is a frequent source of off-by-one errors for beginners, so textbooks emphasize remembering: "start is included, stop is not." If `fam` had at least 6 elements, then `fam[3:6]` would produce a new list of exactly three elements (positions 3, 4, 5). If `fam` had fewer than 6 elements, Python would still return a valid slice up to the end without raising an error, because slicing is designed to be safe within bounds.
# Option A is incorrect because it skips index 3 and incorrectly includes index 6. Option B is incorrect because it includes index 6, which the stop boundary excludes. Option D is incorrect because slicing returns a sublist, not a single element; a single element would require indexing like `fam[6]`.
質問 # 34
What is the name of the tool that can allow a device to run more than one operating system at a time as virtual machines?
正解：C
解説：
Ahypervisoris the software layer that enables virtualization-running multiple operating systems concurrently on the same physical hardware as separate, isolated virtual machines (VMs). Operating systems textbooks describe the hypervisor as managing and multiplexing core hardware resources such as CPU, memory, storage, and I/O devices among multiple guest operating systems. Each VM behaves as if it has its own hardware, while the hypervisor enforces isolation and schedules resource usage.
Hypervisors come in two broad categories.Type 1 (bare-metal)hypervisors run directly on the hardware (common in data centers), whileType 2 (hosted)hypervisors run as applications on top of a host OS (common on desktops). In both cases, the hypervisor is the key tool that makes "more than one OS at a time" possible.
System Restore is a recovery feature, not a virtualization platform. A partition manager can split a disk into multiple partitions, which can support dual-boot setups, but that runs only one OS at a time, not concurrently as VMs. A bootloader selects which OS to start at boot time; again, that is not simultaneous virtualization. Therefore, the correct tool that allows running multiple operating systems simultaneously as virtual machines is the hypervisor.
質問 # 35
Which character is used to indicate a range of values to be sliced into a new list?
正解：A
解説：
In Python, slicing is the standard mechanism for extracting arangeof elements from a sequence type such as a list, string, or tuple. The character that signals a slice range is thecolon:. The general slice syntax is sequence
[start:stop:step]. Most commonly, you see sequence[start:stop], where start is the index to begin from (inclusive) and stop is the index to end at (exclusive). This "inclusive start, exclusive stop" rule is emphasized in textbooks because it makes slice lengths easy to reason about: when step is 1, the number of elements returned is stop - start.
For example, if items = ["a", "b", "c", "d", "e"], then items[1:4] returns ["b", "c", "d"]. Omitting start defaults to the beginning (items[:3] gives the first three elements), and omitting stop defaults to the end (items[2:] gives everything from index 2 onward). The optional step supports patterns like items[::2] for every other element, and negative steps can reverse a sequence (items[::-1]).
The other characters do not define ranges in Python slicing: , separates items (or indices in multidimensional structures), + is addition/concatenation, and = is assignment. The colon is the slicing operator that indicates a range.
質問 # 36
What is the first step in the selection sort algorithm?
正解：D
解説：
Selection sort works by growing a sorted portion of the list one element at a time. The algorithm conceptually divides the array into two regions: asorted prefixon the left and anunsorted suffixon the right. At the beginning, the sorted prefix is empty and the entire list is unsorted. The first step is to consider position 0 as the target location for the smallest element. The algorithm scans the unsorted region (initially the whole list) to find the smallest valueand records its index. That action is exactly what option C describes: determine the lowest value starting from the first position.
After identifying the minimum element, selection sort swaps it into position 0 (if it isn't already there). Then it repeats the process for position 1, scanning the remaining unsorted suffix to find the next smallest element, swapping it into place, and so on. Textbooks emphasize that the key characteristic of selection sort is the repeated "select min (or max) from unsorted region and place it into the sorted region." Option A is not the standard first step; finding both min and max is unnecessary. Option B describes an unrelated swap that doesn't ensure progress toward sorting. Option D is not a "first step" but rather a different ordering goal; selection sort can be adapted for descending order, but the canonical version begins by selecting the minimum for the first position.
質問 # 37
Which method allows a user to convert a string value to all capital letters in Python?
正解：B
解説：
In Python, strings are objects of type str, and the language provides many built-in string methods for common transformations. The standard method used to convert all alphabetic characters in a string to uppercase is upper(). For example, "Hello, World".upper() produces "HELLO, WORLD". This method is part of Python's core string API and is documented as returning anewstring because strings are immutable in Python; the original string is not modified.
Options A and D resemble methods from other programming languages. For instance, toUpperCase() is commonly seen in Java and JavaScript, not Python. Option B, makeUpper(), is not a standard method in Python's str type. Python's naming conventions for built-in methods are typically short and lowercase, which is consistent with upper(), lower(), strip(), and replace().
It is also important to note what upper() does and does not do. It affects letters according to Unicode case-mapping rules, so it works beyond ASCII and supports many languages. Non-alphabetic characters such as digits, punctuation, and whitespace remain unchanged. Because the method returns a new string, it supports functional-style programming and safe reuse of the original data. In many textbook examples, upper() is paired with input normalization tasks, such as case-insensitive comparisons and cleaning user-entered text.
質問 # 38
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