つくえの うえに ほんが （ ）あります。
A. よんほん
B. よんさつ
C. よんまい
D. よっつ
What happens to nitrogen in body tissues if a diver ascends too quickly
A. It forms bubbles.
B. It goes directly to the brain.
C. It is reabsorbed by the lungs.
D. It has a narcotic effect.
じょうずじゃなくても （ ）で いいです。
A. だめ
B. へた
C. うそ
D. やすもの
What does the passage mainly discuss
A. The equipment divers use.
B. The effects of pressure on gases in the human body.
C. How to prepare for a deep dive.
D. The symptoms of nitrogen bubbles in the bloodstream.
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