根据《担保法》,收受定金的一方不履行约定的债务的,应当()。
A.全额返还定金
B.2倍返还定金
C.3倍返还定金
D.4倍返还定金
参考答案:A
The athletes spent as much time getting trained as they __ studying.
A.were
B.had
C.did
D.disliked
属于脂肪酸类衍生物的激素有()
A.前列腺素
B.胃泌素
C.血栓素
D.白细胞三烯
E.多巴胺