How long could divers stay underwater in Halley’s bell? A. Just a few seconds       B. Only a few minutes   C. For days on end    D. For hours at a time

How long could divers stay underwater in Halley’s bell?
A. Just a few seconds
B. Only a few minutes
C. For days on end
D. For hours at a time

Trả lời
Đáp án: D

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