对按一、二、三级抗震等级设计的框架和斜撑构件（含梯段）中的纵向受力普通钢筋，其屈服强

Families separated by the Florida Straits were overjoyed Tuesday and Miami-based charter companies rushed to add seats and flights to their Havana routes after the Obama administration decided to let more Americans visit Cuba as often as they want, and spend as much as they like.

The policy changes are sure to put more money into Cuba’s dying economy, and many would-be travelers are already call for still more barriers to fall. Even Fidel Castro (菲德尔·卡斯特罗) , who had belittled the changes Monday, yielded Tuesday that they were "positive, although minimal".

The United States still doesn’t let most Americans without ties to Cuba visit the island or send in money. But the change, announced Monday by the Obama administration, was among the most significant openings in the half-century of hostilities between the two countries.

During the Bush administration, Americans with immediate family members on the island could visit once every three years and send up to $100 a month to their families.

Now, there are no limits to travel or expense, and the definition of family is expanded to include relatives as distant as second cousins, as well as anyone else who lives as "family" in the home of the authorized traveler.

According to the article, what will this change in policy do for Cuba()

A. It will boost the Cuban economy.

B. It will help defeat Fidel Castro.

C. It will make more Cubans come to the United States.

D. It will decrease the number of Cubans coming to the United States.

依次给画线的字注音，完全正确的一组是

     膝盖   堤岸   剖开   立即   腼腆[ ]

A．qī    dī    pōu    jì    diǎn   

B．xī    dī    pōu    jí    tiǎn   

C．xī    tī    pǒ      jǐ    diǎn   

D．xī   dī    pǒ      jì    tiǎn

|a|=5，|b|=4，ab＜0，则a+b=______．

( )除具有抗热、抗湿及优良的润滑性能外，还能对金属表面起良好的保护作用。

A．钠基润滑脂

B．锂基润滑脂

C．铝基及复合铝基润滑脂

D．钙基润滑脂

贷款批准后，贷款的执行由借贷方负责，项目的执行和采购由( )监督。

A．借贷方
B．政府
C．世界银行
D．策划者