The key components of a computer mouse are the two LED.()
True
False
Not Given
When an ordinary computer mouse get dirty, it has to be replaced with a new one.()
True
False
Not Given
The most durable computer mice on sale are the IBM ones.()
True
False
Not Given
The optical mouse is superior to the basic in that the former has no moving parts.()
True
False
Not Given
Piano
【单选】
What does the passage mainly discuss?()
The historical development of the piano
The quality of tone produced by various keyboard instruments
The uses of keyboard instruments in various types of compositions
The popularity of the piano with composers
Which of the following instruments was widely used before the seventeenth century?()
The harpsichord
The spinet
The clavichord
The organ
The word"supplanted"in paragraph 2 is closest in meaning to()
supported
promoted
replace
dominated
According to the passage, what deficiency did the harpsichord have?()
It was fragile
It lacked variety in tone
It sounded metallic
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?()
The introduction of pedals
The use of heavy wires
The use of felt-padded hammerheads
The metal frame construction
Paragraph④_____
Soot's Role in Climate Changes Above Oceans and Land
Observations of Warming in the Northern Hemisphere
Explanation of Increased Warming Effect Caused by Soot
Black Soot in Snow and Icy Areas Leading to Climate Change
Black Soot Contributing to Global Warming
Greenhouse Gases as the Main Factor of Global Warming
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