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【单选题】
饮用水卫生要求在流行病学上安全,主要是为了确保 ( )A.
不发生消化道疾病
B.
不发生介水传染病
C.
不发生食物中毒
D.
不发生急慢性中毒
E.
不发生地方病
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举一反三
【多选题】Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？ （）
A.
The three required steps in the analog to digital conversion are sampling， encoding， and compression.
B.
The three required steps in the analog to digital conversion are sampling， quantization， and compression.
C.
The three required steps in the analog to digital conversion are sampling， quantization， and encoding.
D.
The output of the sampling process is a pulse code modulation （PCM） signal.
E.
The output of the sampling process is a pulse amplitude modulation （PAM） signal.
【单选题】________ or voice-input devices accept spoken words through a microphone and change the sounds into computer readable signals.
A.
Speech-recognition
B.
Sensor
C.
Sanner
D.
Printer
【单选题】— Why do you drink so much tea? — Well, _____ it doesn't keep me awake in the nights. [ ]
A.
although
B.
as soon as
C.
as long as
D.
while
【单选题】Distress signals may be（）.
A.
red flares
B.
smoke signals
C.
sound signals
D.
Any of the above
【单选题】Why do the middle-aged people prefer tea according to the author?
A.
They become practical and want to save money.
B.
They like the faint and lingering fragrance of the Chinese tea.
C.
Coffee is too bitter for them to drink.
D.
Hot tea is good for their health.
【单选题】Christmas is traditionally an important religious festival in many Western countries, but it’s also celebrated in China. Why do you celebrate Christmas?
A.
Because it’s an opportunity to go shopping and join in an international celebration.
B.
Out of respect for other people’s religions and religious festivals.
C.
Due to its religious importance to me.
D.
Because my friends and classmates all celebrate Christmas.
【单选题】Why is the tea set important?
A.
A good tea set can reflect the color, aroma and taste of tea.
B.
While enjoying tea, it is also helpful to appreciate the fine tea set.
C.
Tea sets are the father of tea.
D.
All of the above.
【单选题】The telephone contains a transmitter and receiver for converting back and forth analog voice and analog electrical signals.
A.
in
B.
between
C.
to
D.
into
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