He wouldn't worry his exam. [ ]
A. about
B. to
C. for
D. with
答案:A
浸入液体里的物体受到的浮力,大小等于物体______,这就是阿基米德原理.
孕妇的合理膳食以下哪项是错误的()。
A.谷类每天400~500g
B.蔬菜每天500g左右,水果每天100~200g
C.肉、禽、鱼、蛋每天50~150g
D.鲜奶每天500ml
E.油脂类每天50g