4.A.numbers C.plenty
B.amounts D.deal
解析：amount表示“数量”，修饰不可数名词；而number表示数量时修饰可数名词。 答案：B
5.A.exercise C.sport
B.exercises D.game
解析：take exercise表示“锻炼”，此时exercise是不可数名词。 答案：A 6.A.sleepy
C.working
B.running D.asleep
解析：此处表示“即使当你睡觉的时候，也在消耗能量”。醒着的情况下，消耗能量是正常的，由空前的even可想到用asleep。
答案：D
7.A.running C.burning
B.adding D.wasting
解析：burn up燃烧；run up升起，欠下；add up加起来；waste浪费。根据空后的calories可知应选择burning。
答案：C
8.A.Children C.Sports
B.Work D.Sport
解析：由下面的the relay race可知，应该选择C项。 答案：C 9.A.much C.few
解析：as much as修饰不可数名词。 答案：A 10.A.poor C.rich
B.low D.plenty B.many D.little
解析：be rich in表示“富含……”；be poor in表示“缺乏……”。蔬菜和水果富含纤维。
答案：C 11.A.more C.rest
B.other D.others
解析：相对于中国来说，用other countries表示“其他国家”。 答案：B
12.A.why
B.because
C.because of D.since
解析：本句表示“那就是很多中国人牙齿白的原因”，应用why。because和since后面接表示原因的句子，because of后面不能接句子。
答案：A
13. A.so C.much
B.very D.such
解析：such healthy foods指上文所述的中国饮食。so不修饰名词；very与句意不符，而much修饰不可数名词。
答案：D
14.A.a number of C.masses of
B.too much D.enough
解析：此处表示“参加的锻炼不足”。a number of许多，修饰可数名词；too much太多，表程度过分；masses of大量，许多；enough足够的。
答案：D
15.A.lose weight C.die
B.put on weight D.stay healthy
解析：“吃的脂肪和糖分过多”和“参加锻炼不足”是身体发胖的原因。 答案：B
16.A.keep up C.keep on
B.carry on D.go on
解析：keep up with为固定短语，意思是“跟上”。 答案：A
17.A.as C.which
B.these D.they
解析：which在此引导非限制性定语从句。as也可以引导非限制性定语从句，但as通常指前面的句子。
答案：C
18.A.bad C.healthy
B.diseased D.junk
解析：糖果、软饮料、巧克力等都属于junk food(垃圾食品)。 答案：D
19.A.to get C.to become 解析：动词avoid后接动词-ing。 答案：B
20.A.keep thin
B.keep fit B.becoming D.get
C.stay calm D.fall ill
解析：and连接并列的成分，此处keep fit与前面的avoid并列。keep fit保持身体健康；keep thin保持瘦身；stay calm保持冷静；fall ill生病。
答案：B Ⅱ.语法填空
阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 If you go to a new school and want to make friends there，what should you do？Here are some tips.
First，be as confident as you 1.________，but don’t be rude.Being confident means that you have a positive attitude 2.________ life in general and other people’s ideas too.
Second，smile and laugh.Smile at people when they look at you，and laugh 3.________ they say something that’s funny to you.It’s a great conversation starter，and it makes you seem 4.________ (friend).
Third，invite others to do things.Often，you’ll need to take the first step to find new friends.Ask some people 5.________ (share)a table at lunch or ask someone to be your volleyball partner in a gym class.
Fourth，join in some activities.6.________ new school and a new group of classmates offer great opportunities to develop some new interests.Try out 7.________ a school play or sports team；try attending a few volunteer activities.
Fifth，have an opinion.Offer your opinions in class and share your opinions in conversations.Ask others what their opinions are.People 8.________ (remember) you in no time and want to talk to you and get to know you 9.________ (well).
Last but not least，remember people’s names.Do your best to remember other people’s names and interests,10.________ means you care about them.
答案：1.can 2.towards/to 3.when 4.friendly 5.to share 6.A 7.for 8.will remember 9.better 10.which
Unit 2 Exercise 3
(建议用时：15分钟)
Ⅰ.阅读理解
Healthy Habits，Healthy Body
Feel tired lately？ Has a doctor said he can’t find anything wrong with you？ Perhaps he sent you to a hospital， but all the advanced equipment there shows that there is nothing wrong with you.
Then，consider this： you might be in a state of subhealth(亚健康).
Subhealth，also called the third state or gray state，is explained as a borderline state between health and disease.
According to the investigation by the National Health Organization，over 45 percent of subhealthy people are middle-aged or elderly.The percentage is even higher among people who work in management positions as well as students around exam weeks.
Symptoms(症状) include a lack of energy，depression (压抑)，slow reactions，insomnia (失眠)，agitation，and poor memory.Other symptoms include shortness of breath，sweating and aching in the waist and legs.
The key to preventing and recovering from subhealth，according to some medical experts， is to form good living habits，alternate work and rest，exercise regularly，and take part in open-air activities.
As for meals，people are advised to eat less salt and sugar.They should also eat more fresh vegetables， fruit and fish because they are rich in nutritional elements－vitamins and trace elements that are important to the body.
Nutrition(营养) experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract(消化系统).They also say that a balanced diet is very helpful in avoiding subhealth.
[语篇导读] 本文介绍了亚健康的症状、原因及治疗的对策。 1.According to this passage，which of the following is RIGHT？
A.When you are in a state of subhealth，you should stay home and keep silent.
B.When you are in a state of subhealth，you should go to see a doctor and buy some medicine.
C.When you are in a state of subhealth，you should have yourself examined in foreign countries.
D.When you are in a state of subhealth，you should find out the reasons and relax yourself. 解析：细节理解题。根据全文及第五、六段可知处于亚健康状态不是待在家里、不是去看医生、也不是到国外去检查，而应该找到症状出现的原因、养成良好的生活习惯，故答案为D。
答案：D
2.It may be easy for middle-aged people to be in a state of subhealth because ________. A.they have used up their energy B.they have lost their living hopes C.they have more pressure in life and work D.they begin to get older
解析：推理判断题。根据第四段及常识可推知中年人易处于亚健康状态是因为来自生活