46.下列血液流動的路徑何者正確?①left atrium ②capillaries ③right atrium ④venules⑤arteries ⑥vena cava (A)④⑥③①⑤② (B)⑥①③⑤②④ (C)⑥④①③⑤② (D)④③①⑤②⑥