The Fourth Period—Section B(2a－2e)
Teaching Important Points 【教学重点】
Key words & phrases：
express，circle，Britain，receive，leader，medical，purpose，prevent，energy，position，victory，enemy，period
at the same time，stop…from becoming ill
Key sentences：
1.Stonehenge is not only one of Britain's most famous historical places but also one of its greatest mysteries.
2.Another popular idea is that Stonehenge might be a kind of calendar.
3.Most historians believe it must be almost 5，000 years old.
Key structure：
modal verb＋be
eg：Most historians believe it must be almost 5，000 years old.
Teaching Difficult Points 【教学难点】
★Practice making inferences and the use of linking words.
Teaching Aids 【教学工具】
A tape recorder，CAI or multimedia courseware.
