多遇地震作用下层间弹性变形验算的主要目的是下列所哪种　( ) A．防止结构倒塌 B．

Barack and Michelle Obama have two daughters: Malia, born in 1998, and Sasha, born in 2001. Before his inauguration, President Obama published an open letter to his daughters in Parade magazine, describing what he wants them and every child in America “to grow up in a world with no limits on your dreams and no achievements beyond your reach, and to grow into compassionate, committed women who will help build that world.”

While living in Chicago, they kept busy schedules. Soccer, dance and drama for Malia, gymnastics and tap for Sasha, piano and tennis for both. Malia and Sasha attended the private Sidwell Friends School in Washington, DC. The Obama girls began classes there on January 5, 2009. In his victory speech on the night of his election, President Obama repeated his promise to Sasha and Malia to get a dog to take with them to the White House. On April 12, 2009, it was reported that the Obamas had adopted a six-month-old Portuguese water dog given to them as a gift. The dog was named Bo by Malia and Sasha.

Though Malia and Sasha Obama are the president's kids, it doesn't mean they'll be catered to. The girls are still required to do their chores. Besides bed-making, Malia and Sasha must clean up their rooms and keep on top of their homework. The Obamas want their girls to grow up in a “normal” way.

小题1:Which statement is RIGHT?

A．Sasha is two years older than Malia.

B．Sasha is three years older than Malia.

C．Sasha is two years younger than Malia.

D．Sasha is three years younger than Malia.小题2:Malia and Sasha were permitted to take       to the White House by Obama.

A．a cat

B．a dog

C．a horse

D．a doll小题3:.Malia and Sasha both have learned         .

A．soccer and dance

B．gymnastics and tap

C．piano and tennis

D．dance and piano小题4:Which is NOT the hope of the Obamas for Matia and Sasha?

A．To do some housework.

B．To grow up in a different way

C．To do their homework well.

D．To achieve their dreams.小题5:Which statement is NOT right according to the passage?

A．Obama wants every child in America happy.

B．Bo was six months old when it was taken into the White House.

C．Malia and Sasha are the students of Sidwell Friends School.

D．Obama published an open letter to his daughters in the newspaper.

下列关于铁元素的叙述中正确的是(　　)

A．2Fe^3＋＋Cu===2Fe^2＋＋Cu^2＋成立说明氧化性：Fe^3＋> Cu ^2＋

B．25℃，pH＝0的溶液中，Al^3＋、NH₄⁺、NO₃^—、Fe^2＋可以大量共存

C．5.6 g铁与足量的氯气反应失去电子为0.2 mol

D．硫酸铁溶液中加入铁粉，滴加KSCN溶液一定不变红色

实验室中常用Br₂的CCl₄溶液鉴定烯键，其反应历程是（）

A.亲电加成反应

B.自由基加成

C.协同反应

D.亲电取代反应

20世纪在俄国和苏联重要的象征派诗人是（）和（）。