Astronauts said that humans ________ find some way to communicate with aliens.
A.
might
B.
ought
C.
do
D.
did
________ is popularly used to enable people from different countries to have meetings. People can watch, and listen to each other through a screen.
A.
Chatting
B.
Video conferencing
C.
Texting
D.
Emailing
A.
aquatic
B.
ceramic
C.
geographic
D.
specific
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Sinh Học lớp 12
