题目内容：

    Limited to a narrow seat for hours with just a tiny bag of cookies and orange juice to comfort yourself, the last thing you feel like doing when you get off a plane is to wait around for your bags. The easy choice when traveling has been to limit yourself to a carry-on suitcase and pray it fits in the overhead bin. Not only does it get you out of the airport faster but it’s also free. Not any longer, however.

Recently, some airlines are starting to charge for carry-on bags, and travelers aren’t at all happy about it. Packing light might not be a choice anymore when looking for tips to get the best airfare possible.

Some smaller airlines such as Frontier and Spirit have always charged customers for carry-on bags, but now bigger name airlines, such as United, are starting to do it too. When you buy a Basic Economy ticket through United，you’re not allowed a full-size carry-on bag unless you’re a Mileageplus Premier member. If you forget to check your bag before security and bring it all the way to the gate, not only will you pay the checked-bag fee, but you’ll have to pay an additional $ 25 gate handling charge. Not the best way to start off a trip. Don’t miss these additional things airlines don’t want to tell you but every flier should be aware of.

You might think that the new carry-on bag guidelines are due to space limitations in the overhead bins, but it has more to do with on-time rates（准时率）. Aviation economies experts and seniors vice president of ICF Aviation Samuel Engel told Vox that the biggest bottleneck when it comes to boarding is carry-on luggage. For every minute a plane isn’t in the air, it’s losing money. A delayed flight makes the crew(乘务人员) look bad and passengers very angry So, the next time you fly, plan to check your bag before security, pay a bit more for your ticket so you are allowed a carry-on, or try rolling a week’s worth of clothes into a backpack, a still-allowed “personal item”.

1.What does the first paragraph intend to tell?

A.People’s anger during a flight B.People’s attitude toward waiting for luggage

C.Convenience for carry-on suitcases D.New policies for free carry-on suitcases

2.Which of the following is NOT the reason why more airlines begin to charge for carry-ons?

A.Space limitations. B.Passengers’ support

C.On-time rates D.Increasing costs.

3.What is the main idea of the passage?

A.Tips for dealing with increasing carry-on rates

B.Instructions before taking a flight

C.Passengers’complaints(抱怨) about the airlines.

D.More airlines are starting to charge for carry-on bags