問題詳情

三、短文填空 (21~30 題,選出最適當的選項)    The cardiovascular system 21 the heart, blood vessels, and blood. From the heart, blood travels intothe arteries and their smaller branches. It continues to the capillaries. Then, it moves to the branches of the vein22 to the heart. The heart serves as a pump. Arteries transport blood from the heart to bodyorgans and tissues. Veins transport blood back to the heart.
21.
(A) is composing
(B) is composing of
(C) is composed
(D) is composed of

參考答案

答案:D
難度:簡單0.772727
統計:A(1),B(2),C(2),D(17),E(0)

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