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During the summer vacation this year, I thought I should do anything meaningful instead of staying at home, so I got a job at a KFC fast food restaurant, working there as a cleaner. I worked seven hours a day for three week. The job was hard and bored and seemed endless, which made me very tired that I nearly gave it up half way. And I went on with determination. Every day I started off for work early in the morning and got to home lately in the evening. Finally I finished the job before the new term begins. Now, I understand that work means. I think it is really successful experience.

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Medical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule£¬protecting them from the body-and the body from them£­until they can be released at just the right spot. There are lots of ways to trigger(Òý·¢)this release£¬including changing temperature£¬acidity£¬and so on. But triggers can come with their own risks£­burns£¬for example. Now£¬researchers in California have designed what could be a harmless trigger to date£ºshining near-infrared light(NIR£¬½üºìÍâÏß)on the drug in the capsule.

The idea of using light to liberate the drug in the capsule isn't new. Researchers around the globe have developed polymers(¾ÛºÏÎï)and other materials that begin to break down when they absorb either ultraviolet(UV£¬×ÏÍâÏß)or visible light. But tissues also readily absorb UV and visible light£¬which means the drug release can be triggered only near the skin£¬where the light can reach the capsule. NIR light largely passes through tissues£¬so researchers have tried to use it as a trigger. But few compounds(»¯ºÏÎï)absorb NIR well and go through chemical changes.

That changed last year when Adah Almutairi£¬a chemist at the University of Califomia£¬San Diego£¬reported that she and her colleagues had designed a polymer that breaks down when it absorbs NIR light. Their polymer used a commercially available NIRabsorbing group called onitrobenzyl(ONB)£®When they catch the light£¬ONB groups fall off the polymer£¬leading to its breakdown. But ONB is only a so-so NIR absorber£¬and it could be poisonous to cells when it separates from the polymer.

So Almutairi and her colleagues reported /span>creating a new material for capsules that's even better. This one consists of a long chain of compounds called cresol groups linked in a polymer. Cresol contains reactive(Ò×·´Ó¦µÄ)components that make it highly unstable in its polymeric form£¬a feature Almutairi and her colleagues use to their advantage. After polymerizing the cresols£¬they cap each reactive component with a light-absorbing compound called Bhc. When the Bhcs absorb NIR light£¬the reactive groups are exposed and break the long polymer into two short chains. Shining additional light continues this breakdown£¬potentially releasing any drugs in the capsule. What's more£¬Almutairi says£¬Bhc is 10 times better at absorbing NIR than is ONB and is not poisonous to cells.

¡¾1¡¿According to the passage£¬which of the following could be the best trigger?

A£®Temperature change.

B£®NIR light.

C£®Acidity change.

D£®UV light.

¡¾2¡¿Why is ONB unsatisfactory?

A£®It breaks down when it absorbs NIR light.

B£®It falls off the polymer and triggers drug release.

C£®It has not come onto the market up till now.

D£®It is not effective enough and could be poisonous.

¡¾3¡¿Which word can be used to complete the following process of changes?

A. protected

B£®formed

C£®exposed

D£®combined

¡¾ÌâÄ¿¡¿Chances are that you want to develop peak performances in each area of your life. Whether it's relationships, study or career, you want to make your performance best. ¡¾1¡¿ Here are four easy tips to help you in your life:

l. Imagine the best

Imagination is a powerful tool that will help you perform well. You can often think about good and attractive things happening in your daily life._ ¡¾2¡¿ As you imagine yourself in such a situation, you gain strength and passion to get you inspired

2. ¡¾3¡¿

You're bound to face negative thoughts and emotions, but you don't have to allow them to control you. Take some time to see if you primarily have positive or negative thoughts. Then when a negative thought arises, change it into a positive one

3. Stay out of your comfort zones

Comfort zones keep you safe and will hold back your personal grow that's all right to be in a cozy state at times, but be sure to step out once in a while. ¡¾4¡¿ It's natural to feel anxious to do so. Remember to have courage to rise and push you forward

4. Take immediate action

Plenty of people have goals in their mind or even written down, but they don't accomplish them ¡¾5¡¿ You'll soon find out that when you follow these steps one by one, you've achieved your success before you know it

A. Say no to the pessimistic

B. Try something brand new that you've been putting off

C. Such a desire is certainly possible when you grasp some basic skills

D. For example ,often experiencing success from promotions to salary rise

E. Accomplish your task ahead of time

F. Don¡¯t let unfinished tasks wear you out ,but get them done

G. Prepare for the pressure

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