单项选择题

?可以在头脑中进行抽象的符号运算，在头脑中把事物的形式和内容分开，进行逻辑运演，这属于认知发展的（　　）

A.形式运算阶段
B.具体运算阶段
C.前运算阶段
D.感知运动阶段
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To: Gloria Stefani [stefig@weweb.com]From: Reesa Bonjani [rbonjani@harborfalls.net]Subject: February fireworks scheduleDate: December 16Dear Ms. Stefani,Thank you for inquiring about the fireworks at Harbor Falls waterfall. Attached to this message you'll find a schedule of our fireworks displays for the month of February. I'm sure you'll be able to find a suitable date around which to plan your trip.Also, if you're interested in staying at one of the hotels that offers a view of the waterfall and fireworks, please visit our Web site at www.harborfalls.net and click on the link for nearby hotels. Don't hesitate to contact me with any more questions.Enjoy your stay at Harbor Falls.Sincerely,Reesa BonjaniHarbor Falls Department of Tourism.-------------------------------------------------------------------------------------------------------------------------Harbor Falls Fireworks ScheduleFebruary Thursday February 1(for the beginning of February)Saturday February 10Wednesday February 14(for Valentine's Day)Saturday February 17Sunday February 18(for the Lunar New Year)Monday February 19(for President's Day)Saturday February 24* Fireworks displays during the month of February will start at 9 p.m.* Dates and times are subject to change and will be updated on the Web site when that information becomes available.* Fireworks displays may be cancelled due to adverse weather conditions.According to the e-mail, what has Ms. Stefani done?
A.VisitedHarborFalls
B.Reservedahotelroom
C.Requestedinformation
D.Contactedhertravelagent
单项选择题
Ms. Benihana is knowledgeable in several disciplines, but especially biomedical engineering isher area of ( ).
A.expert
B.expertise
C.experts
D.expertness
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