根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage．)

　　We sometimes call the lion“the king of the jungle(丛林)”because it is stronger and more dangerous than other animals．It can 　　1　　 faster than many animals and it can hunt(捕猎)the beast．It is the highest animal in the 　　2　　 food chain(食物链)．

　　In the sea, the shark is one of the animals at the 　　3　　 of the food chain．It can swim faster than 　　4　　 other sea animals, and it can use its big teeth to eat them．

　　What is at the top of the world's food chain?　　5　　 are! We are not the biggest or fastest, but we are the 　　6　　．We could not run faster than cheetahs(猎豹), so we 　　7　　 cars and now we can move the fastest．We could not 　　8　　 better than lions, so we invented guns(枪)．Now we can hunt the beast．

　　People's inventions are clever, but they can be 　　9　　, too．For example, people invented 　　10　　, and now they make the air and rivers dirty．This can make 　　11　　 changes．Dirty rivers kill fish．　　12　　 bears cannot eat the fish and the bears die．If we kill one part of the food chain, 　　13　　 also die．Remember that we are a part of the food chain, 　　14　　 we are in danger too! If we protect animals, we are protecting 　　15　　!We should and we could do something for the world!

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阅读下面短文，从短文后所给各题的四个选项(A、B、C、D)中，选出可以填入空白处最佳选项。

　　Self reflection means stopping the mad rush of activity and calming yourself and your mind so your brain can evaluate(评价)the input it has already received．Some people prefer to do 　　1　　 self reflections mentally，while others keep a diary or written notes of some kind．Whether written or purely mental，the 　　2　　 is the same．

　　School textbooks are often divided into units of study．This can make it 　　3　　 for someone who wants to begin the process of self reflection to get started．Wait times when you complete a unit of study in any of the 　　4　　 you are learning：math，science or any other topic．Sometimes you are reminded that the unt is over 　　5　　 there is so** test．Use these natural breaks as chances to stop and reflect．

　　　　6　　 a quiet place．This can even be sitting at your desk at school when you finished early and the other students are 　　7　　 working．If you are going to take notes，take your reflection diary．Write doen some 　　8　　 on things that you learned in this uont ont know before you began．Let your mind ponder(思考)on the notes you have written some connections．Next，think about the things that you still wonder about．　　9　　 learned a new way to solve a math problem, but you're not sure when to use it．Write questions will help you remember to 　　10　　 seeking answers the next time you are expert the same topis．

　　Self reflection is an essential skill for a successful student．If you have never taken the time to reflect, try it now．

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when　  where　  how  　what  　if　  because  　so  　but　  and　  while