短文填空
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.
合并的二次根式是（ ）.