中国古代农业长期领先世界。下列中国古代农业生产工具和生产技术出现的先后顺序是：
A．①②③④⑤
B．①③②④⑤
C．①③②⑤④
D．①②③⑤④
答案：D
Japanese Vice-Premier Sumochizi called on Friday for _____ all-out effort to develop ___friendly relationship with neighboring Asian countries.
A．an; a
B．an;\
C．the; the
D．\;the
甲氧苄啶结构式为（）
A.
B.
C.
D.
E.
