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CEFR READING PART PRACTICE – TRUE OR FALSE
Read the text and find out whether the statements A-F is True or False.
Put
A
if the statement is True or put
B
if the statement is False.
TASK 18
A) An individual packet contains a group of data.
B) A digital signal first should be transmitted into an analog one to be sent to the
receiver.
C) Voice conversations are often delayed.
D) A Virtual Classroom enables pupils to speak to each other.
E) If you want to speak, you should click a button on the screen.
F) The teacher uses a microphone to write down key words.
With the advances in network technologies, we are able to send voices over the Internet now.
The way it works is that a group of data will be separated into an individual packet. These
packets are then transmitted from the sender to the designated receiver through the Internet.
They can take different
routes in the way, but will be repackaged to the original format at the
receiver’s end. In case of voice transmission, since it
is an analog signal, it will have to be
converted into digital signals first, sent over
the Internet to the receiver, and converted back
to analog signals to resume the original voice. The major difference with the data
transmission is that voice conversations have to be in real time, with no delays and
discontinuity, so it will be just like talking on the phone. The quality is getting there with the
latest VoIP technologies. Unlike a physical classroom where the teacher and students are all
in the same room, in a Virtual Classroom the teacher and the students
are all sitting in front
of their computers. They are able to listen and speak to each other using their computers and
microphones through the Internet. This is what we call a virtual classroom. It is actually very
similar
to a physical classroom, in that: 1. When one person speaks, the rest of the people in
the room will be able to listen. 2. A student need to “raise hand” to request to speak,
typically by clicking a button on the screen. 3. There will be a white board where the teacher
can write down
key words, sentences, and etc.
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