题目内容
It is so difficult to ______ the bottom of the ocean because some parts are very deep.
查看答案
搜索结果不匹配？点我反馈
更多问题
It was about 30 seconds before Alex ______ from the water; we were quite scared.
We often ______ that when other people do the same things as we do, they do them for the same reasons; but this _______ is not always reasonable.
There is widespread concern that the rising unemployment may ______ a threat to social stability.
After a(n) ______ physical exam, my doctor said I was in good condition except that my blood pressure was a little high.
微信支付 
支付宝支付