2017-2018学年人教版必修2 Unit3 Section Ⅲ练习含解析
5．They have sold out all the books in the bookshop.
1．First as a PC and then as a laptop, I ________(use) in offices and homes since the 1970s.
2．Over time my memory ________(develop) so much that, like an elephant, I never forget anything I ________(told)．
3．Since the 1970s many new applications ______(find) for the computer.
4．I have also ________(put) into robots and used to made mobile phones as well as help with medical operations.
5．I have even ________(put) into space rockets and sent to explore the Moon and Mars.
1．have been used
2．has developed; have been told
3．have been found