直角三角形两条边长分别为6cm、8cm，则第三边长为（）．

抗结核药物化学预防的对象有（）。

A.未经规范治疗的、非活动性肺结核的老年患者

B.与活动性肺结核患者有密切接触史，PPD近期阳转者

C.痰涂片抗酸杆菌阳性的活动性肺结核患者

D.PPD阳性、强阳性的青少年并发结核超敏感症状者

E.PPD阳性、乙肝大三阳患者

Many English learners have difficulty deciding what kind of English accent they want to have. A US accent, perhaps modeled on the way a Hollywood star speaks? Or maybe you want to imitate（模仿） the British accent of a BBC news reader?

Young British people find the US accent attractive while young US people like a British accent. Especially when the person speaking is of the opposite sex! Let’s listen to what they have to say.

Stephen Yang, 17, from London, UK

A US accent is cute, especially when a girl speaks it. Whether it’s Jessia Alba speaking or the girl- next-door, the way US girls speak has a sweet tingle that is really sassy(时髦). A girl from Texas recently moved into our neighborhood. Her Texan twang（鼻音） had all the boys here on their knees within seconds of meeting her.

To me, accents reflect the attitudes, characteristics and lifestyles of the people.

Jennifer Sun, 16, from New Jersey, US

From watching English actors like Daniel Radcliffe, my friends and I have developed a soft spot for British men. Some are attracted to the qualities of English males, while others admire their sense of style.

Everyone, however, agrees that the most appealing aspect of an English man is his accent. For example, many American girls watch Harry Potter movies over and over again just to listen to the actors speak.

The English accent seems almost like art.

小题1:In Stephen Yang’s opinion, accents just show__________.

A．the beauty of the language

B．how the language is spoken

C．the cultural differences of the speakers

D．the fashion of the day小题2:The underlined word “cute “probably means__________.

A．strange

B．exciting

C．attractive

D．fashionable小题3:Many American girls watch Harry Porter again and again in order to __________.

A．learn the acting skills of the these stars

B．learn the magic performed by Harry Potter

C．imitate the actors’ accents

D．know more about British English小题4:What is probably the best title for this passage?

A．British English and American English

B．British Accent or American Accent

C．American English Accent is Most Accepted

D．The difference between British Accent and American Accent.

甲醇是仅次于烯烃和（）的重要有机原料。

A.炔烃

B.芳烃

C.环烷烃

D.烷烃

刘邦建立西汉后，将异姓王铲除，设置许多同姓王，并约定此后"非刘氏而王者天下共击之"。在这里，刘邦特别看重的是（）。

A.古代的分封制度

B.血缘亲族关系

C.西周礼乐文明

D.文字契约的承诺