C. Iceland, Finland, the US, the UK D. Iceland, Finland, the UK, the US

13．How does the World Happiness Report measure happiness?

　　A. By asking a question. B. By having a conversation.

C. By doing scientific research. D. By carrying out an online survey.

14．What problem is the US faced with?

A. Its people live an unhappy life. B. Its economy is going down hills.

C. Its social problems are hard to solve. D. It has a lower happiness level than before.

15．What's Jeffrey Sachs' attitude toward Donald Trump?

　　A.Supportive. B. Unfavorable. C. Respectable. D. Uncaring.

第二节　（共5小题；每小题3分，满分15分）

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Be at your best !

　　What does your brain need to work well? Here are some things it needs.

Good food

　　Experts say that breakfast is much more important than any other meal. 16 . So don't miss breakfast ─ especially before an exam! But you need to eat a good breakfast ─ junk food won't work.

A regular supply of energy

　　Your brain needs a regular supply of energy, so you need to eat carbohydrates (碳水化合物). They are found in bread, rice, pasta and beans. 17 . They work more quickly than bread and rice, so they give you a short burst of energy, but afterwards you feel more tired.

A continuous supply of oxygen

　　 Your brain needs oxygen, which it gets from exercise. 18 . You also need a good supply of iron because iron helps your blood to carry oxygen round your body.

Water

　　 19 . Not getting enough water will stop your brain from working well. And remember, water isn't as expensive as sweet drinks!

　　 20

　　Your brain needs several hours' sleep, so it can 'update' itself, just like a computer. Experts say that when you study for a test or exam, you should get some sleep as quickly as possible after you've finished studying. This helps you to remember what you've learnt.

　　A. A short break

　　B. A good night's sleep

C. It works best in the morning