单项选择题
Generally, the thicker a mammal's (哺乳动物) skin is, the l...
单项选择题Generally, the thicker a mammal's (哺乳动物) skin is, the less hair
His hard work ______ when he won the prize.A．paid offB．...
单项选择题His hard work ______ when he won the prize.
My father ______ an invitation to a dinner party, but h...
单项选择题My father ______ an invitation to a dinner party, but he ______ it.
