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

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

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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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