托福模拟试题（上）

39. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

The class of chemicals called hormones was discovered by two researchers studying a substance produced in the small intestine.

Answer Choices

The term hormone is based on a Greek word that means "to excite" or "to set in motion."Researchers are looking for ways to decrease the dangers of treatments with growth hormone so that more patients can benefit from it.

Hormones can be given artificially, but such treatments have risks and must be used carefully.Hormones can affect not only life processes such as growth but also behavior and emotion.

Scientists have discovered that not only the nervous system but also certain chemicals can affect bodily processes far from their points of origin.Hormone replacement therapy (HRT) may increase the risk of blood clots and heart disease in middle-age women.

Answer Keys

Reading：

27. B

28. A

29. D

30. C

31. D

32. C

33. B

34. D

35. A

36. D

37. A

38. third square

39.1) Scientists have discovered that not only the nervous system….

2) Hormones can affect not only life processes…..

3) Researchers are looking for ways to decrease the dangers of ….