（2017年四川南充）-Mike, let’s prepare for our baseball game.

-OK. We’ll lose the game ______ we try our best.

A. unless B. once C. after D. since

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This day is called the National Day of Education on the Safety of Elementary and Middle School Students(NDESEMSS) (全國中小學生安全教育日). The theme of the day this year is to give students more knowledge about safety and make sure their lives safe.

A survey done by the China Youth and Children Research Centre showed that school accidents kill more elementary and middle school students than anything else. The main accidents come from stampedes，earthquakes, fires and sports injuries(傷害)．

What can we do to keep ourselves safe? Staying calm is the first and most important rule when facing accidents. But different accidents have different self protection advice.

A stampede is possible anywhere. The larger a human crowd gets, the more likely stampedes become. When students around you begin to push, stand still and try to hold onto something, or stay in a corner until the crowd leaves. If you fall down in a moving crowd, cover your head with both hands. Lean to one side, curl up your body and bend your legs.

Earthquakes are common natural disasters(災(zāi)難). When you feel the ground shake, drop down, take cover under a desk and hold on. You should stay indoors until the shaking stops. If you are outdoors, don't stay near buildings, trees or power lines.

When there's a fire, follow the teachers' instructions, leave the classroom quickly and use a piece of cloth to cover your mouth and nose so that you don't breathe in smoke.

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A. To give students more knowledge about safety and make sure their lives safe.

B. To give students more knowledge about health and make sure they eat healthily.

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