退火的目的是（）。 A.提高硬度和耐磨性 B.降低硬度，提高塑性 C.提高强度和韧性

Of Chinese secondary school students top ten heroes,Mao Zedong,ranks number one and Olympic track gold medal winner,Liu Xiang,ranks fifth,according to a survey conducted by All-China Women’s Federation (ACWF).

Late Chinese leaders,Mao Zedong and Zhou Enlai,and revolutionary martyrs,Liu Hulan and Dong Cunrui,all have remained important heroes in the eyes of Chinese teenagers aged 13 to 18.

Meanwhile,the 2004 Olympic track and field star,Liu Xiang;model police chief,Ren Changxia;Hong Kong action star,Jackie Chan,and China’s first astronaut Yang Liwei,have ascended to be the new stars among the students.

“The coexistence of old and new models in youth’s hearts reveal the new era’s character,” said Han Xiangjing,president of “China Women” magazine attached to ACWF.

The respondents also chose their parents as heroes,ranking number two.

“This reflects that young students’ selection standards of heroes have changed to be more human oriented,emotional and personalized,”Han said.

Reasons given by the surveyed students for this choice are:“parents are the people I love and indispensable to me”and“they consistently guide,encourage and support me.”

The survey was conducted in six provinces and cities across China,including Beijing,Shanghai,Henan,Shanxi,Liaoning and Hunan.Students completed 1018 questionnaires;443 polled were boys and 575 were girls.

小题1:This passage most probably appears _________.

A．in a newspaper

B．in a magazine

C．in a history book

D．in a report小题2:This passage mainly talks about _________.

A．a survey about teenagers’top 10 heroes

B．why teenagers regard their parents as heroes

C．different heroes in teenagers’eyes

D．All-China Women’s Federation小题3:How many heroes of the top 10 can be found in the passage?

A．10.

B．9.

C．8.

D．7小题4:Which of the following is NOT the reason why teenagers choose their parents as heroes?

A.Their parents are the people they love very much.

B.Their parents are indispensable to them.

C.Their parents have done something great and successful.

班氏丝虫多寄生在人体的（）

A.血液和淋巴系统

B.四肢浅表的淋巴系统

C.深部淋巴系统

D.肺部毛细血管

E.四肢表浅及深部的淋巴系统

1.8mol氯气与元素A的单质完全反应生成1.2mol的氯化物Acl_x，则x的值为  [ ]

A．1

B．2

C．3

D．4

河长制坚持（）为导向

A.政策

B.问题

C.绿色

D.可持续发展

发电企业应按照实际入炉煤量和入炉煤机械取样分析的（）发热量正平衡计算发、供电煤耗率。

A、高位

B、低位

C、平均

D、加权