The White House is the most visited residence in the world.Tours may be scheduled thro

ugh our Washington DC office.Due to security and scheduling procedures，there are a few things you should know before requesting a tour：

•Only groups of 10 or more may request a tour.

•Requests must be submitted with a minimum of one month’s advance notice from the date of the tour. Notice of whether your application is accepted will be given 10 days prior to the date requested.All tours，even after they have been confirmed，are subject to cancellation due to security interests.

•Tours are only conducted Tuesday through Saturday from 7：30 am to 11：30 am

To process your request for a tour，please contact our Washington office at (202)224—5521 and provide the following information：

•Date(s) requesting.

•Security information for each person in your party，including：name as it appears on I.D.(I.D.required for ages14 and up)，date of birth，social security number，country of origin，and citizenship(公民的).

•A home address and daytime and evening phone numbers for the designated(指派的)leader of the group.

•A contact number while in DC for the designated leader of the group.

After your request is confirmed or denied，our office will contact you with further instructions.

26.This notice is to provide information about ____.

A.scheduling of Washington DC tours

B.the security system of the White House

C.application for a tour of the White House

D.duties of a tour group leader

27.The White House is open to the public___.

A.on weekdays only

B.five days a week

C.every other day

D.on weekends only

28.Application for a group tour of the White House must be submitted____.

A.exactly on the date of application

B.at least 30 days in advance

C.any day between Tuesday and Saturday

D.10 days before the date of the tour

29.After your tour request has been confirmed,____.

A.it is still possible that your tour may be canceled

B.you are still allowed to change your visiting date

C.you can surely visit the White House that day

D.it is necessary for you to start your tour immediately

30.It can be inferred from the passage that ____.

A.teenagers under 14 are not allowed to visit the White House

B.foreigners are less likely to be permitted to tour the White House

C.separate tours call also be scheduled for individual visitors

D.security is the chief concern in scheduling White House tours