Ⅰ.单词拼写
1．The chart shows an up________(趋势) of meat prices.
2．The parents________(记录) every step of their child's development.
3．So far Internet has become the main channel through which the computer________(病毒) spread.
4．Sometimes an________(附件) with a nice name in your mail can be very dangerous.
5．If your computer shows such information, it warns you that you are________(感染)．
