2013高考英语一轮总复习优化课时作业及答案：新人教版必修2 Unit 3
Unit 3 Computers
Ⅰ.单项填空
1．He got seriously ill at the age of four.Later he couldn’t hear anything at all.He was________deaf.
A．nearly B．totally
C．especially D．probably
2．So hard________it to work out the problem that I decided to turn to Professor Green for the valuable advice.
A．I did find B．did I find
C．I found D．found I
3．Scientists say it may be two to five years________it is possible to test the medicine on human patients.
A．since B．after
C．before D．when
