下列选项中,不是造成海陆变迁原因的是 [ ]
A、地壳变动
B、海平面升降
C、沧海桑田
D、填海造陆
答案:C
As we all know, _________ exercise will help to strengthen the heart and improve circulation of the blood.
A.normal
B.average
C.regular
D.ordinary
填写操作票严禁并项,不得倒项、涂改,但根据实际情况可以添项。