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【简答题】
US student Vanessa Tahay stands out from the other teenagers in her school.Her skin is dark and her accent is thick. If you ask her , she will tell you these are the things she is proudest of. Tahay is a poet, and at 18 she was considered among the best in Los Angeles. When she is on the stage , audiences often go silent. They also laugh, shout and cry.But this doesn ’ t come easily for someone who comes from a village that sits at the base of a huge mountain range in Central America.When she first appeared at school, she was teased by others for being short and different.She never spoke, so they called her “mouse” . “How do I defend myself ? ” Tahay thought.“I don ’ t know how.” “Keep going , ” her mother would tell her. “At some point, you ’ ll learn.” She spent hours after school and on weekends watching the same DVD: English Without Barriers . Tahay ’ s elder brother, Elmer, persuaded her to go to the after­school poetry club. In the last six years, her English teacher Laurie Kurnick has turned Cleveland Charter High School ’ s poetry program into one of the most respected in the city.Her team draws from the likes of D . H.Laurence, Pat Mora and Kendrick Lamar to create poems about their own lives. The poems focus on many things — some funny, some painful. The first time Tahay read the group ’ s poems, she was wild with joy. “I wish I could write like that , ” she thought.“I want to say something.” She wrote her first poem about her first year in America. She called it Invisible . The day her turn came to recite poems in front of the team, she broke down crying. She cried for 15 minutes.“I had so much held in , ” Tahay said.“I couldn ’ t even finish it.” But she kept at it despite her less­than­perfect grammar, spelling and diction ( 措辞 ) . Still, she wouldn ’ t tell her friends about her poetry because she worried they would make fun of her. But with time, her poems changed her. “They gave me pride , ” Tahay said. “They told me that I ’ m worth something.” “She had this innocence , ” Kurnick said. “This willingness to be genuine shows you things you don ’ t ever see.”
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【多选题】债券的久期与到期时间、票面利率、付息频率、到期收益率存在的关系为( )。
A.
零息债券的久期等于到它的到期时间
B.
债券的久期与票面利率呈负相关关系
C.
债券的久期与到期时间呈正相关关系
D.
债券的付息频率与久期呈负相关关系
【单选题】债券的久期与到期时间呈()关系
A.
正相关
B.
不相关
C.
负相关
D.
不确定
【多选题】根据声波传播是波阵面形状,声波可分为:
A.
平面声波
B.
球面声波
C.
柱状声波
D.
曲面声波
【简答题】声波可以传递 ,声波也可以传递 。
【单选题】( )决定了声音的音色。
A.
声波的频率
B.
声波的振幅
C.
声波的波形
D.
声波的变化
【多选题】以下关于“债券久期”与“债券的到期收益率”的关系描述正确的是?
A.
其它因素保持不变,则到期收益率越低久期越长。
B.
到期收益率越低,远期支付的现金流权重越大,加权平均的到期时间越长。
C.
到期收益率与久期呈正向关系
D.
到期收益率与久期呈反向关系。
E.
到期收益率越大,远期支付的现金流权重越大,加权平均的到期时间越长。
【单选题】()决定了声音的音色
A.
声波的频率
B.
声波的波形
C.
声波的振幅
D.
声波的变化
【简答题】声波可以传递______,声波也可以传递______.
【单选题】声波按频率分为三类:次声波、()和超声波。
A.
可听声波
B.
微声波
C.
次微声波
D.
可超声波
【简答题】高于______Hz的声波叫超声波,低于______Hz声波叫次声波.为了不影响学习、工作,声音不得超过70______,医生给孕妇做B超,说明声波能够传递______;医生用超声波除去人体内的结石,说明声波能够传递______.
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