2011自考英语二考试重点：Unit 02 复习精要
12．The termswewouldnormally use to describe a scientific phenomenon are inadequate here. P1
13.Astronomersand scientists think that a black hole is a region of spaceinto whichmatter has fallen andfrom whichnothing can escape. P1
14. Some starsexplodewhentheir density increases to a particular point. P2
15. This processof shrinking may be so intensethata black hole results. P2
16. It isonlyrecentlythatastronomers have begun specific research into black holes. P3
17. Very advancedtechnologycould one daymake use ofthe energy of black holes for mankind. P5
18. He has exertedall hisstrengthtoattain his goal.
19. He has been exertinga lot of pressure on me to change my mind.
20. The collapseof the government left the country in confusion.
21. The research group launched out intoa series of new experiments