2011英语四级考试仔细阅读练习(2)(8)

C) reducing its water content

D) altering its structure

39. The word “colonies” (Line 2, Para. 4) refers to ________.

A) tiny globules

B) watery regions

C) bacteria communities

D) little compartments

40. Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial attack ________.

A) by varying its chemical composition

B) by turning it into a solid lump

C) while keeping its structure unchanged

D) while retaining its liquid form

Unit 2

21. B 22. A 23. B 24.D 25. C

26. A 27. C 28. C 29.A 30. B

31. D 32. B 33.C 34. D 35. A

36. A 37. B 38. D 39.C 40. D