（从左到右填写）

①O₂   ②Mg²⁺   ③   ④   ⑤ ⑥

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。

★  Many children like to eat snacks ineveryday life, and some of them even have snacks during dinner. To maintain thenormal meals and stay healthy, it is necessary to regularly eat snacks forchildren in their spare time.____

★Prepare healthy snacks in advance. When you make somethingyourself，youget to control the ingredients(原料)and put in what's good for you! You can also keep plenty of fresh fruit andvegetables at home to take on the go.____Keep the servings in bags in the fridge, ready to grab and go.

★____

Makeit a habit to store some fruit, whole­grain crackers, or baby carrots in yourbackpack so you always have some healthy food nearby. Half a cheese sandwichalso makes a great snack to have on standby (备用)．

★  ____

Healthysnacking doesn't have to be boring as long as you give yourself a variety ofchoices.

Whole­wheatbiscuits with peanut butter or low­fat fruit yogurt are healthy, tasty, andeasy.

★Satisfy cravings (渴望)with healthier approaches.

____ An 8­ounce mug of hot chocolate has only 140calories and 3 grams of fat. A chocolate bar, on the other hand, has 230calories and 13 grams of fat.

Eveningscan be a tempting time to have sugary, fatty snacks. If you're really feelinghungry, don't ignore it. Instead, pick the right snacks to fill the hunger gap.Whole­wheat bread, rice cakes, or popcorn can do the trick, so can fruit pairedwith cheese or yogurt.

A．Make it interesting.

B．Keep healthy snacks with you.

C．Read serving size information.

D．Cut up melons or vegetables inadvance.

E．Here are some ways to make healthysnacking part of your daily routine.

F．If you like to do some cooking aboutsnacks, you can follow the following ways.

G．If you're crazy for chocolate, try ahot chocolate drink instead of a chocolate bar.

下面是一些关于学生吸烟的数据，请用一句话概括它的主要内容。(不超过40字)

    据有关统计，我国吸烟人群平均年龄呈下降趋势，各职业高中生中，超过90%的男生吸烟，我国13~18岁青少年约1.3亿，已超过5 000万人吸烟或尝试吸烟。吸烟学生出现斗殴、赌博和观看色情制品的行为是不吸烟学生的2.6倍至4.1倍，吸烟学生出现抑郁、自杀意念和离家出走行为是不吸烟学生的1.2倍到4倍，失足青少年试吸率和吸烟率分别为94.4%和69.7%。

    Never Put off Tomorrow What You Can Do Today

    Want to put off studying for the physics test? Or writing that thirty-five-page research paper on future uses of biotechnology? Sure you do? And who wouldn't? But it's still a silly idea to put off doing something until a future time. Here is why ....

    ____. The task will be still the same. It won't be any more fun and you still won't want to do it. As the deadline gets closer and closer, the task seems to become larger and larger if you haven't started the work. And the stress increases. Now not only do you have to write that paper, you have to do it under great pressure.

    ____ . Before you start, it seems that the task is unlikely to be accomplished. But you know what? You're probably miscalculating. Get started -------- maybe on a small piece ------ And you will discover that you have more resources and know more about the subject than you thought. Result? You won't experience nearly as much suffering as you expected to. Things are guaranteed ------ 100 percent ------- to get better.

    ____ . If you leave your work before the night before it's due, you give up the possibility of getting input from your professor. Professors regularly give advice ----- or at least a few useful tips ---- during office hours. Unfortunately though, they don't usually hold office hours at midnight, so you will be out of luck when you discover the night before the midterm that you have no idea how to do the questions that will count for two-thirds of your grade.

    ____ Ever wonder why the professor assigns the papers two weeks before it's due? It's because he or she expects you to be thinking about the issue, or doing the research, for two weeks. No, not every waking moment, but at least some of the time. After all, the professor could just as easily have given the assignment one week before it was due if he or she expected less thinking. When you throw together a paper or a report at the last minute, your ideas are half-baked. And your professor will know it.

    ____ . If you put things off at the last minute, you might find that you haven't budgeted enough minutes to finish the necessary tasks. It's the easiest thing in the world to miscalculate how long it will take to do all the work especially when new issues arise ------ like illness, family problems, computer breakdowns, trouble at work, and all the other things ------- as you are thinking through your paper argument or preparing yourself for the coming test. If you keep delaying, you don't allow yourself time for those various life events that have an adverse(不利的) effect on your ability to complete your assignment.