Research has become both simpler and more complex. It's simpler because,____ you have computer, you can find information you need by searching the Internet. For all you information, you don't have to go to ____library to find the relevant resource and take notes on it. Instead, you can find some sources from the Internet____print the copies needed. Remember, however, that you should usually consult different types of sources. That is, you ____always rely just on the Internet for you research.

    While finding information is easier than ever, at the same time, researching has become ____ complex. There is a lot more material available, which means you may be overwhelmed ____the amount of information. You need to learn ____ to sort through and find the relevant information for your particular project. Also,____ need to check the accuracy of it.

设O为坐标原点，A（1，1），若点B（x，y）满足$\left\{\begin{array}{c}{x}^2+y^2\ge 1\\ 0\le x\le 1\\ 0\le y\le 1\end{array}\begin{array}{c}\\ \end{array}\right.$，则$\overrightarrow{OA}·\overrightarrow{OB}$取得最小值时，点B的个数是(   )

2016年11月12日，首支中巴经济走廊试商贸车队从中国新疆喀什出发，沿着中巴经济走廊一路南行了3000余公里抵达瓜达尔港并将货物装船发往海外。中巴经济走廊北起我国新疆喀什，南至巴基斯坦瓜达尔港，是一条包括公路、铁路、油气管道和光缆通道在内的贸易走廊，也是“一带一路”的重要组成部分。下图为中巴两国建设中的“中巴铁路与石油管道并行线路模拟图”。结合图回答问题。