請依下文回答第 46 題至第 50 題       The arrival and check-in process for your cruise can seem overwhelming and chaotic, but it's generally organized.Your cruise line will send you information about when to arrive at the port, giving a several-hour “window,” typicallyfrom late morning to mid-afternoon. You can show up at any time during that window. Generally speaking, the busiesttime for boarding is between noon (when most cruise lines' regular check-in begins) and 2 p.m., so we recommendarriving just before or after that window. Bear in mind: If you arrive too early, you might have to wait around, especiallyif the passengers from the previous cruise are still disembarking. You also shouldn't cut it too close, understanding thatif you arrive after check-in has ended, even by just a few minutes, you likely will not be allowed to board.       When you arrive at the cruise terminal, the first thing to do is locate your boarding documents (either mailed to youor printed out at home) and your identification (passport or driver's license and birth certificate), and keep them handy.       Upon entering the terminal, you'll need to show your cruise documents and go through a security line. You willneed to pass through an x-ray machine and have your carry-ons scanned, but the process is not as rigorous as at theairport. (You likely won't need to remove your shoes, for example.) Then you'll enter a large open space with roped-offlines and check-in stations. Cruise line staff will be on hand to direct you to the correct line; suite passengers and high-status past-passengers will typically go into a shorter line or separate waiting area, while regular passengers join a mainline.
【題組】46 Which of the following is closest to the meaning of the highlighted word “window” in the first paragraph?
(A) interval
(B) outing
(C) portal
(D) frame