题目

Why does the author mention the specimen preserved in the birth canal?_____

A

To illustrate that the embryo fossils are quite advanced in their development

B

To explain why the fossils are well preserved

C

To indicate how the ichthyosaurs died

D

To prove that ichthyosaurs are marine animals

考点:阅读选择

第三段中提到保存在产道中的标本,是为了说明胚胎发育的程度很高。

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What does the passage mainly discuss?()

A

The historical development of the piano

B

The quality of tone produced by various keyboard instruments

C

The uses of keyboard instruments in various types of compositions

D

The popularity of the piano with composers

Which of the following instruments was widely used before the seventeenth century?()

A

The harpsichord

B

The spinet

C

The clavichord

D

The organ

The word"supplanted"in paragraph 2 is closest in meaning to()

A

supported

B

 promoted

C

replace

D

dominated

According to the passage, what deficiency did the harpsichord have?()

A

 It was fragile

B

 It lacked variety in tone

C

 It sounded metallic

D

 It could not produce a strong sound

According to the information in the third paragraph, which of the following improvements made it possible to lengthen the tone produced by the piano?()

A

The introduction of pedals

B

The use of heavy wires

C

The use of felt-padded hammerheads

D

The metal frame construction

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