题干

下列关于声音的说法正确的是(   )

A:声音是电磁波的一种

B:声音的频率越高,响度越大

C:声音是由物体的振动产生的

D:声音的振幅越大,音调越高

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答案(点此获取答案解析)

C

同类题5

根据短文内容,选择最恰当的答案

◆ GONE WITH THE WIND

Author: Margaret Mitchell ¥25 (in bookstores) ¥18 (online)

Gone With the Wind is a best-seller, which tells a story that happened in the American Civil War (美国内战). Scarlett O'Hara is a woman in the story who is full of energy. She is strong and saves her family but is very selfish at the same time.


◆ A LITTLE PRINCESS

Author: Frances Hodgson Burnett

¥18.3 (online)

Motherless Sara Crewe was sent home from India to school at Miss Minchin's. Her father was very rich and she lived a rich and comfortable life. Then her father died and Sara lost everything. She had to learn to do with her changed life. Her strong character made her able to fight successfully against her poverty (贫穷) and the scorn (嘲笑) of her fellows (伙伴). It's an excellent book with 4 tapes (磁带) for children.


◆ PETER PAN

Author: J.M Barrie

¥15 (in bookstores) ¥12 (online)

It is a children's story full of imagination and adventures (冒险), which is about Wendy, John, and Michael Darling's adventures in Never-Never Land with Peter Pan, the boy who would not grow up. The children are happy and lovely. (with 2 tapes)


◆ UNCLE TOM'S CABIN

Author: Harriet Beecher Stowe

¥20 (in bookstores)

The most famous novel in American history, Uncle Tom's Cabin talked about

the struggle between free states and slave (奴隶) states during the American Civil

War and is as powerful today as when it first came out 150 years ago.


◆ THE SECRET GARDEN

Author: Frances Hodgson Burnett ¥35 (in bookstores) ¥30 (online)

Mary Lennox, a sickly orphan (孤儿), finds herself in her uncle's dark house.

Why are so many rooms locked? Why is one of the gardens locked? And what is that crying she hears at night? Through the power of hope, friendship, and the magic of nature, the brave girl brings the house and a long-lost garden back to life.