参考答案：

Keys:
1—5 BDDAA 6—10 BDABB 11—13 DBC 14—16 ACD

17. stuck 18. Subway 19. 2143556 20. invitation

21. her last exam 22. the city center 23. Boston 24. European art museum

听力评分标准

1、17—20 题，每拼错一个单词扣1分。

2、21—24 题，每拼错/漏写/误写一个单词扣0.5分。

3、23、24题首字母必须大写。

II. Grammar and vocabulary

25—29 CBBAB 30—34 CADDB 35—39 CBC(B)DC 40 C

41—45 GHCAJ 46—49 FBEI

III. Reading

50—54 BDCAB 55—59 BBCCC 60—64 AACCA

65—68 BDCC 69—71 BDA 72—75 ADAB

76—80 ACEFB

81. chemicals in the brain

82. they needed more junk food to stimulate their pleasure centers/ needed more brain stimulation to feel good

83. By delivering a small electrical charge to the rats’ brains.

84. To understand the role the brain plays in obesity/ how chemicals in the brain contribute to obesity.

简答题评分标准
1、内容正确，语法基本正确，得2分。

2、 内容基本正确，语法正确或虽有错误，但不影响理解，得1分。

3、 即使语法正确，但是内容错误，得0分。

4、 答案超过规定字数过多，得0分。

Translation:

1.We had better take/do exercise/ exercise every day.

2. Don’t hesitate to contact me/get in touch /make contact with me if you need more/any further information.

3. The total amount of the export this year has increased by three times, compared with/to that of the same time last year.

4. It is essential/necessary for students to participate in social activity/practice (in order) to learn something that they can’t get in class.

5. Long before children are able to speak or understand a language, they can communicate with adults through facial expressions and by making noises.Children can communicate with adults through facial expressions and by making noises long before they are able to speak or understand a language.