题目内容：

 

 

Do you know anything about airport security(安全)? In order to protect passengers, airports have 1.________rules. Some of these rules include:

Restricted items

2.________ are not allowed on board. In the past, knives under four inches were allowed on board, 3.________ now, knives are not permitted at all.

ID checks

All passengers must have ID cards 4.________ match their boarding passes. Passengers are unable to fly5._________these documents.

Security on the aircraft

Generally, 6.________ are not permitted to enter the cockpit, where the pilot sits, 7.________when the plane is in the air. In order to increase security, bullet-proof doors and locks are now standard on all planes.

Forbidden liquids

No liquids over 100ml may be 8.________ on board in hand luggage. Liquids 9.______ 100ml must be carried in a clear plastic bag. This 10.________water, shampoo, toner etc