最早记载日本的历史文献是（）
A.《三国志·倭人传》
B.《后汉书·倭人传》
C.《义楚六贴》
D.《三国志·吴书》
参考答案：A
He was a good swimmer so he _____ swim to the river bank when the boat sank. [ ]
A. is able to
B. could
C. was able to
D. can
加间苯三酚及盐酸试液显红色或紫红色的为
A．木质化细胞壁
B．木栓化或角质化细胞壁
C．纤维素细胞壁
D．硅质化细胞壁
E．黏液质细胞壁
