下列化合物中，不能发生Claisen酯缩合反应的是（）

A、开链β-酮酸酯

B、环状β-酮酸酯

C、α，β-不饱和化合物

D、甲基酮类化合物

A、1

B、2

C、3

D、4

A.

B.

C.

D.

根据下列文章,请回答 26～30 题。

Text 2

Steveland Morris is a household name in America. Ask Steveland Morris and he' 11 tell you that blindness is not necessarily disabling. Steveland was born prematurely (过早地，不到期地) and totally without sight in 1950s. He became Stevie Wonder--composer, singer, and pianist. The winner of ten Grammy awards, Stevie is widely acclaimed(喝彩) for his outstanding contributions to the music world.

As a child, Stevie learned not to think about the things he could not do, but to concentrate on the things that he could do. His parents encouraged him to join in his sighted brothers as many activities as possible. They also helped him to sharpen his sense of hearing, the sense upon which the usually disabled are so dependent.

Because sound was so important to him, Stevie began at an early age to experiment with different kinds of sound. He would bang things together and then imitate the sound with his voice. Often relying on sound for entertainment, he sang, beat on toy drums, played a toy harmonica (口琴), and listened to the radio.

Stevie soon graduated from toy instruments to real instruments. He first learned to play the drums. He then mastered the harmonica and the piano. He became a member of the junior church choir(唱诗班) and a lead singer. In the evenings and on weekends, Stevie would play different instruments and sing popular rhythm and blues tunes on the front porches (走廊) of neighbors' homes.

One of Stevie' s sessions was overheard by Ronnie White , a member of a popular singing group called The Miracles. Ronnie immediately recognized Stevie' s talent and took him to audition (试听) for Berry Gordy, the president of Hitsville USA, a large recording company now known as Motown. Stevie recorded his first smash hit

"Fingertips" in 1962 at age twelve, and the rest of Stevie' s story is music history.

第 26 题 This passage could be entitled

A．The Music World

B．Stevie Wonder

C．Great Musicians

D．Blind People

根据材料回答下列各题： Steveland Morris is a household name in America. Ask Steveland Morris and he 11 tell you thatblindness is not necessarily disabling. Steveland was born prematurely(过早地, 不到期地) and total-ly without sight in 1950s. He became Stevie Wonder composer, singer, and pianist. The winner often Grammy awards, Stevie is widely acclaimed(喝彩) for his outstanding contributions to the musicworld. As a child, Stevie learned not to think about the things he could not do, but to concentrate onthe things that he could do. His parents encouraged him to join in his sighted brothers as many activi-ties as possible. They also helped him to sharpen his sense of heating, the sense upon which the usu-ally disabled are so dependent. Because sound was so important to him. Stevie began at an early age to experiment with differ-ent kinds of sound. He would bang things together and then imitate the sound with his voice. Oftenrelying on sound for entertainment, he sang, beat on toy drums, played a toy harmonica(口琴) ,andlistened to the radio. Stevie soon graduated from toy instruments to real instruments. He first learned to play thedrums. He then mastered the harmonica and the piano. He became a member of the junior churchchoir(唱诗班) and a lead singer. In the evenings and on weekends, Stevie would play different in-struments and sing popular rhythm and blues tunes on the front porches (走廊) of neighbors homes.One of Stevie’s sessions was overheard by Ronnie White, a member of a popular singing groupcalled The Miracles. Ronnie immediately recognized Stevie’s talent and took him to audition (试听)for Berry Gordy, the president of Hitsville USA, a large recording company now known as Motown.Stevie recorded his first smash hit "Fingertips" in 1962 at age twelve, and the rest of Stevie’s story ismusic history. This passage could be entitled________

A.The Music World

B.Stevie Wonder

C.Great Musicians

D.Blind People

下列音节不符合拼写规则的是___。

A.qüanmian luoshi(全面落实)

B.yiangwuang qünshan(仰望群山)

C.zhanzai duian(站在对岸)

D.chuentian lailin(春天来临)

A、loup

B、chef

C、lait

D、amour

对于不同含水量土壤背景LAI分析，土壤线分析法比NDVI法有更好适用性。()

Steveland Morris is a household name in America. Ask Steveland Morris and he'll tell you that blindness is not necessarily disabling. Steveland was born prematurely(过早地，不到期地) and totally without sight in 1950s. He became Stevie Wonder—composer, singer, and pianist. The winner of ten Grammy awards, Stevie is widely acclaimed(喝采) for his outstanding contributions to the music world.

As a child, Stevie learned not to think about the things he could not do, but to concentrate on the things that he could do. His parents encouraged him to join his sighted brothers in as many activities as possible. They also helped him to sharpen his sense of hearing, the sense upon which the usually disabled are so dependent.

Because sound was so important to him, Stevie began at an early age to experiment with different kinds of sound. He would bang things together and then imitate the sound with his voice. Often relying on sound for entertainment, he sang, beat on toy drums, played a toy harmonica(口琴), and listened to the radio.

Stevie soon graduated from toy instruments to real instruments. He first learned to play the drams. He then mastered the harmonica and the piano. He became a member of the junior church choir(唱诗班) and a lead singer. In the evening and on weekends, Stevie would play different instruments and sing popular rhythm and blues tunes on the front porches (走廊)of neighbors' homes.

One of Stevie's sessions was overheard by Ronnie White, a member of a popular singing group called The Miracles. Ronnie immediately recognized Stevie's talent and took him to audition(试听) for Berry Gordy, the president of Hitsville USA, a large recording company now known as Motown. Stevie recorded his first smash hit "Fingertips" in 1962 at age twelve, and the rest of Stevie's story is music history.

This passage could be entitled ______.

A．The Music World

B．Stevie Wonder

C．Great Musicians

D．Blind People

Text 2

Steveland Morris is a household name in America. Ask Steveland Morris and he'll tell you that blindness is not necessarily disabling. Steveland was born prematurely(过早地，不到期地) and totally without sight in 1950s. He became Stevie Wonder—composer, singer, and pianist. The winner of ten Grammy awards, Stevie is widely acclaimed(喝采) for his outstanding contributions to the music world.

As a child, Stevie learned not to think about the things he could not do, but to concentrate on the things that he could do. His parents encouraged him to join in his sighted brothers as many activities as possible. They also helped him to sharpen his sense of hearing, the sense upon which the usually disabled are so dependent.

Because sound was so important to him, Stevie began at an early age to experiment with different kinds of sound. He would bang things together and then imitate the sound with his voice. Often relying on sound for entertainment, he sang, beat on toy drums, played a toy harmonica (口琴) ,and listened to the radio.

Stevie soon graduated from toy instruments to real instruments. He first learned to play the drums. He then mastered the harmonica and the piano. He became a member of the junior church choir(唱诗班) and a lead singer. In the evenings and on weekends, Stevie would play different instruments and sing popular rhythm and blues tunes on the front porches (走廊) of neighbors' homes.

One of Stevie's sessions was overheard by Ronnie White, a member of a popular singing group called The Miracles. Ronnie immediately recognized Stevie's talent and took him to audition(试听) for Berry Gordy, the president of Hitsville USA, a large recording company now known as Motown. Stevie recorded his first smash hit "Fingertips" in 1962 at age twelve, and the rest of Stevie's story is music history.

This passage could be entitled

[A] The Music World

[B] Stevie Wonder

[C] Great Musicians

[D] Blind People