[单项选择]Sound travels __ air.
A. through water faster and
B. where it is faster through water than through
C. faster through water than through
D. faster than through water and

[单项选择]Sound travels in the form(形式)of ______.

[单项选择]ECHO: SOUND
A. reflection: light
B. microphone: hearing
C. conservation: talk
D. implication: tone

[单项选择]The novel Gulliver's Travels is written by
A. Daniel Defoe.
B. Jonathan Swift.
C. Francis Bacon.
D. James Joyce.

[单项选择]Sound changes may include the loss of a sound or sounds. The so-called apocope refers to the omission of a vowel segment________. ( )
A. in word-initial
B. in word-middle
C. in word-final
D. in syllable-initial

[单项选择]One who travels in a foreign country and learns its language will ______.
A. find out what its people are like
B. argue in favour of this country and the language
C. know the country andits people better
D. like its inhabitants and their language

[单项选择]

B
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000km. But sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke comes from his gun before the sound reaches your ears.
This great speed of light gives us some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light left the moon 1.3 seconds before it reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some case, the light from one of tonight’s stars started on its journey to you before you were bola.
Thus, if you want to be honest, you cant say" The stars are shining to night" You have to s
A. around
B. only
C. at least
D. nearly