[单项选择]

Airport baggage screeners in the USA, displaying seized chain saws, machetes and knives, (21) travelers to check their luggage for offensive objects before boarding a (22) .
Officials of the Transport Security Administration (TSA) (23) that since February 2002 more than 7.5 million (24) items had been seized. They included 50,000 box cutters-- a (25) said to be used by the Sept. 11, 2001 hijackers --and 1,437 firearms as (26) as 2.3 million knives.
The TSA officials told a news conference most people with (27) items in their bags intended no malice but advised (28) to consult the website www. tsatraveltips.usa for advice on what to leave behind when (29) a trip.
Since the Sept. 11 attacks screeners have confiscated seemingly (30) items like nail clippers and cigarette lighters (31) passengers.
But some carry more obviously (32) items. Chain saw
A. tools
B. weapon
C. conditions
D. facts

Airport baggage screeners in the USA, displaying seized chain saws, machetes and knives, (21) travelers to check their luggage for offensive objects before boarding a (22)
Officials of the Transport Security Administration (TSA) (23) that since February 2002 more than 7.5 million (24) items had been seized. They included 50,000 box cutters--a (25) said to be used by the Sept. 11, 2001 hijackers --and 1,437 firearms as (26) as 2.3 million knives.
The TSA officials told a news conference most people with (27) items in their bags intended no malice but advised (28) to consult the website www.tsatraveltips.usa for advice on what to leave behind when (29) a trip.
Since the Sept. 11 attacks screeners have confiscated seemingly (30) items like nail clippers and cigarette lighters (31) passengers.
But some carry more obviously (32) items. Chain saws,
A. harmless 
B. dangerous 
C. forbidden 
D. prohibited