动物试验是食品毒理学研究的主要方法和手段。动物试验可分为()和()两种方法。
参考答案:体内试验,体外试验
The little girl is walking along the beach, happy and joyful, ________ bending down to pick up a beautiful seashell.
A.approximately
B.regularly
C.apparently
D.occasionally
涤纶机织布制女上衣 ( )