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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。
What is a yawn（哈欠） and why do people yawn? A yawn is often associated with a person being tired． People yawn for many reasons including stress, boredom, emotion and overwork．
Have you noticed that yawning seems to be contagious （会传染的）? If one person yawns, this appears to cause another person to yawn．Researchers have found that 40-60% of people who see a picture of someone yawning will yawn themselves．
Some people think that yawning is rude and suggests that you are bored or uninterested．Maybe a yawn is a signal to a group that it’s time to go to sleep, or if someone yawns when they're bored, it may be a sign to change the topic of conversation． Animals of all types yawn．If you have a dog or cat, you've probably seen your pet yawn several times．Even some birds yawn such as cockatiel parrots, Adelie penguins and Emperor penguins．
Some of the scientific explanations of why we yawn claim it is caused by physical needs．One likely explana??tion is that the yawning reflex happens when our blood needs more oxygen．The deep breath helps supply the levels of oxygen in our blood． It is also thought that the same chemicals in our brain that affect our moods and emotions cause us to yawn．
Superstitions about yawning have been around for hundreds of years and can date back to the ancient Greeks．A common superstition says that a person must cover his or her mouth when yawning so that the soul does not escape through the mouth． Today most people do not believe these superstitions and know that a yawn is a physical reflex．
A．Did you yawn while reading this article?
B．Yawning is not limited to humans．
C．It will make you lose interest in your work．
D．But this is not always the cause for a yawn．
E．Even reading the word YAWN can make people yawn．
F．However, it doesn't mean that you need rest or relax??ation．
G．Other people believe that yawning is a sign that danger is near．
H．Another common theory is that a yawn helps regulate our body temperature．
查看习题详情和答案>>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。
What is a yawn（哈欠） and why do people yawn? A yawn is often associated with a person being tired． People yawn for many reasons including stress, boredom, emotion and overwork．
Have you noticed that yawning seems to be contagious （会传染的）? If one person yawns, this appears to cause another person to yawn．Researchers have found that 40-60% of people who see a picture of someone yawning will yawn themselves．
Some people think that yawning is rude and suggests that you are bored or uninterested．Maybe a yawn is a signal to a group that it’s time to go to sleep, or if someone yawns when they're bored, it may be a sign to change the topic of conversation． Animals of all types yawn．If you have a dog or cat, you've probably seen your pet yawn several times．Even some birds yawn such as cockatiel parrots, Adelie penguins and Emperor penguins．
Some of the scientific explanations of why we yawn claim it is caused by physical needs．One likely explana??tion is that the yawning reflex happens when our blood needs more oxygen．The deep breath helps supply the levels of oxygen in our blood． It is also thought that the same chemicals in our brain that affect our moods and emotions cause us to yawn．
Superstitions about yawning have been around for hundreds of years and can date back to the ancient Greeks．A common superstition says that a person must cover his or her mouth when yawning so that the soul does not escape through the mouth． Today most people do not believe these superstitions and know that a yawn is a physical reflex．
A．Did you yawn while reading this article?
B．Yawning is not limited to humans．
C．It will make you lose interest in your work．
D．But this is not always the cause for a yawn．
E．Even reading the word YAWN can make people yawn．
F．However, it doesn't mean that you need rest or relax??ation．
G．Other people believe that yawning is a sign that danger is near．
H．Another common theory is that a yawn helps regulate our body temperature．
查看习题详情和答案>>The most important _____ of his speech was that we should all work whole-heartedly for the people.
A. element B. spot C. sense D. point
查看习题详情和答案>>His wife looks ___ than he is.
A. many younger B. much young C. more younger D. much younger
查看习题详情和答案>>阅读下面短文，掌握其大意，然后从36---55各题所给的四个选项（A,B,C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Peter and Paul had a permission from their parents to camp in a field close to their farm. But, being adventurous boys, they know it would be more 36 to camp in the woods that lay beyond the river. Excitedly, the boys 37 with their tent and food. Ks5u
Carrying their heavy 38 , the two brothers walked along the riverbank, hardly noticing the distance or the sun beating down. . They were eager to reach their 39 before lunchtime. As they entered the cool, shadowy woods, they began to search for a suitable camping spot. Peter wanted to 40 close to the river at the edge of the woods, 41 Paul, who was older, insisted that they camp further away. 42 Peter followed his brother deeper into the 43 . “This really is a wonderful setting!” said Paul in excitement. They 44 the tent , and settled down to eat the sandwiches they had made, then decided to find their way 45 to the river to catch some fish. Ks5u
“Are you sure that this is the right 46 ?” whispered Peter shakily. “I’m sure we passed that hollow tree just a while ago. ” Paul walked 47 silently. “Look, there it is again. We’re lost, aren’t we?” complained Peter. Paul had to admit that he didn’t know where they were. 48 , they were a long distance from where they were 49 to be. They were not even 50 of where they had set up their camp. They set in 51 for a few minutes until Peter had a bright idea. “Why don’t we look for clues（线索） the way trackers 52 in the movies? We weren’t careful about how we walked, so I’m sure we would have left 53 some broken tree branches and leaves. ” Ks5u
Carefully, the boys 54 the marks that they had left, until finally they found their campsite. Hurriedly, they packed their belongings and set off 55 the direction of the river. Ks5u
What would their parents think of their adventure? K
A. surprising B. exciting C. annoying D. frightening
A. went round B. went back C. went away D. went though
A. load B. torn C. food D. storage
54.
55.
A. grassland B. destination C. field D. river
A. live B. lie C. wait D. stay
A. but B. and C. or D. so
A. Unconsciously B. Unfortunately C. Unwillingly D. Uninterestingly
A. woods B. farm C. setting D. camp
A. put off B. put on C. put down D. put up
A. forward B. near C. back D. further
A. place B. mark C. way D. time
A. alone B. about C. in D. on
A. After all B. At last C. Above all D. At first
A. discovered B. encouraged C. persuaded D. supposed
A. afraid B. sure C. informed D. reminded
A. enjoyment B. satisfaction C. disappointment D. imagination
A. appear B. do C. work D. behave
A. behind B. out C. aside D. amount
A. fetched B. watched C. followed D. collected
A. for B. to C. at D. in
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