一道初中二年级的英语题look over examine check都意为“检查”，但它们在用法有什么区别呢？

1.look over 检查
2.examine 及物动词 vt. 检查，细看
look at something or someone carefully
All the machines will be examined.
所有机器都将检查一遍。
· I examined the door and found that it was locked.
我检查这个门，发现它上了锁。
3.check及物动词 vt. 检查；核对
to look at something to make sure it is all right
· Will you check these figures?
这些数字你检查一遍好吗？
· Before taking off, the pilot checked both engines carefully.
在起飞前，飞行员仔细检查了两个发动机。
· Would you check the tyres please?
请你检查一下这些轮胎好吗？
· The guard stopped Lenin so as to check his pass.
卫兵拦住列宁，要检查他的通行证。
· Before being used, the machine must be checked.
机器使用前要先检查。
· Did the engineer have the machine checked?
工程师叫人检查机器了吗？

look over 是做好试卷后检查
examine是对某种物品的检测，检验它是否达到标准
check是检查事情有没有做好，范围较广：比如检查与医生的预约、试卷等