thought to the __40__ of your goal and even set a new one.

III. Reading Comprehension

Section A

Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.

　　This article is for all of the teenagers out there. Even though __41__ you are years from being fully grown, society regularly expects you to adult. Yes, you are __42__ in many ways: many of you drive and do so quite safely, and you handle schedules that would __43__ many adults. But you probably cannot process caffeine (咖啡因) as constantly as your parents can because of your still-growing bodies and brains.

　　I understand it feels grown-up to be drinking a cup of Starbucks. But all of this caffeine may worsen your anxiety, affect tonight's sleep and tomorrow's school performance, __44__ nutrient absorption and even cause real trouble when mixed with alcohol. The following four aspects may well __45__ the theme of this article.

The power of caffeine

Caffeine is widely considered a drug that is socially acceptable, universally used, even cool, but it still causes __46__ symptoms such as headaches, fatigue and a lack of attention when removed from coffee-addicts' diets.

How much is healthy?

Caffeine is by no means a nutrient; you do not need it to be healthy. __47__, it is a substance that can leave you lacking nutrients because it has been shown to reduce calcium (钙). Caffeine probably causes the body to release water. And the more caffeinated drinks you consume, the less likely you are to drink water. So experts say that adolescents should consume __48__ amounts of caffeine a day (≤100 mg).

Caffeine's __49__

According to the Centers for Disease Control and Prevention, about 65 percent of middle and higher schoolers are __50__ to insufficient sleep on school nights. Some of their sleep problems can be mainly attributed to (归因于) caffeine, which can remain in the body for seven hours after __51__, thus causing teens' worse performance the next day. It is widely assumed that adequate sleep __52__ proper growth and brain development. During childhood and adolescence, the brain goes through a period called synaptic pruning (突触修剪) when unnecessary connections are promoted.

Caffeine labelling

　　Caffeine is not listed on the Nutrition Facts column on food labels because it is not a __53__. It may be listed as an ingredient, but the amount is not required. Caffeine is now added to foods such as gum, candy and water, along with makeup and beauty products that __54__ to reduce swelling (肿块).

　　Taste preferences and eating habits are often cultivated in childhood and adolescence, so teens, when you consume sweet, caffeinated drinks every time you feel sluggish (无精打采的), you are creating a pattern that may be hard to break as an adult. It is advisable to come up with other __55__ ways to boost energy so that you can master adulting better than many adults.

41. A. potentially B. necessarily C. developmentally D. materially

42. A. mature B. experienced C. productive D. disciplined

43. A. delight B. frustrate C. liberate D. exclude