导致苯丙酮尿症发病的苯丙氨酸羟化酶缺乏的部位
A．肝细胞
B．脑细胞
C．甲状腺
D．血细胞
E．肾组织
参考答案：A
在______里填上＞、＜或=．
20平方分米______0.2平方米6平方米______600平方厘米 32个月______3年．
—How could you __________ your friend so easily?
—She is the kind of person who __________ in a crowd. [ ]
A. pick out; stands out
B. make out; stands for
C. take out; stands by
D. bring out; stands aside
