Blood from the veins, high in carbon dioxide but ______, returns to the right at

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问题 Blood from the veins, high in carbon dioxide but ______, returns to the right atrium of the heart.

选项 A、being low in oxygen
B、low in oxygen
C、lower oxygen
D、is low in oxygen

答案 B

解析 Low in oxygen is parallel to high in carbon dioxide, to which it is joined by but.

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