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问题 选择题

把抛物线y=x2向左平移1个单位，所得的新抛物线的函数表达式为（ ）

A．y=x2+1

B．y=(x+1) 2

C．y=x2－1

D．y=(x－1) 2

答案

答案：B

题目分析：二次函数的平移规律：横坐标左加右减，纵坐标上加下减.

把抛物线向左平移1个单位，所得的新抛物线的函数表达式为.

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Teens Talk
Lisa Black
Age 13
Mexico City, Mexico
“My favorite kind of music is salsa, and my favorite singer is Mare Anthony. Salsa is a kind of Latin music. Why do I like salsa? Well, it’s exciting. There’s always salsa music at our home. That’s because my parents love it— and because we live next to a salsa music store!”
Tom White
Age 14
New York City, USA
“What’s my favorite kind of music? I like all kinds of music, but my favorite is techno. It’s too cool! My brother hates techno— he thinks it’s terrible! He doesn’t understand it. But I understand his music either—he thinks country music is great!”
Linda Green
Age 13
Paris, France 
“My favorite kind of music is classical. My friends think I’m boring. but I think classical music is really cool. My mom and dad like classical too, and my dad has a great collation of classical CDs.”
 
小题1:Lisa Black likes salsa and she thinks it is ________.
A. exciting                B. terrible       C. boring
小题2:Tom White comes from_________.
A. Mexico City, Mexico     B. New York City, USA    C. Paris, France
小题3:Linda and her parents like music, and _________ has a great collation of classical CDs.
A. her brother             B. her mother             C. her father
小题4:Lisa Black is the same age as _________.
A. Linda Green           B. Tom White            C. Tom’s brother
小题5:The topic of today’s talk is about teen’s __________.
A. favorite collation       B. favorite music          C. favorite singer
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单项选择题

通常在肠外营养中，糖提供总热量的

A．45％

B．50％

C．55％

D．60％

E．65％
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