There are many trees on _____ side of the road,so it's very cold.

                                                                                                                                                        [ ]

A. any  

B. all  

C. both  

D. either

非典型苯丙酮尿症()
典型苯丙酮尿症()
唐氏综合征()

A．染色体畸变

B．苯丙氨酸羟化酶缺乏

C．氨基己糖苷酶缺乏

D．四氢生物喋呤生成不足

E．甲状腺发育异常