My uncle is a policeman．He has towear uniforms to work．题目和参考答案——青夏教育精英家教网——

题目内容

7．My uncle is a policeman．He has towear uniforms to work．

分析我的叔叔是一名警察，他必须穿制服上班．

解答答案：wear．has to 是have to的三单形式，表示不得不…，后加动词原形，结合句意我的叔叔是一名警察，可知是要穿制服上班，wear uniforms穿制服，wear表示"穿"，故答案是wear．

点评 have to表示客观需要做的事情，意思是"必须"、"不得不"．后跟动词原形，有人称、时态和数的变化，与情态动词 must 近义．have to 比较强调客观需要，而 must 着重说明主观看法．

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相关题目

17．Be pleased to do anything even though it is very tiny．In fact，there's no single thing that is not worth doing or you are not able lo do．So living a happy life with a light heart is the most important．A good mood decides your quality of life．Then （21）Bcan you live a happy life？
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根据短文内容选择最佳答案．

21．A．what	B．how	C．why
22．A．stay	B．staying	C．stays
23．A．are giving	B．will give	C．will be given
24．A．proud	B．afraid	C．tired
25．A．Somebody	B．Nobody	C．Everybody
26．A．failure	B．success	C．troubule
27．A．have had	B．have	C．has
28．A．are different from	B．are fond of	C．are similar to
29．A．always	B．seldom	C．never
30．A．not only；but also	B．neither；nor	C．either；or．

12．Last weekend，Jack ____ to a library party and he had a lot of fun．（　　）

I am a dragon hunter．Dragonflies，that is!My name is Keith Wilson．I'm an odonatologist．That's a scientist who studies dragonflies．I don't hunt to kill．I hunt to discover．So far，I have helped to find many new species，or kinds，of dragonflies．
Flying Colors
dragonfly
Why do I look for dragonflies？The answer is simple．I love them!They can speed by．They can make sharp turns
and sudden stops．They can even fly backward．
Best of all，dragonflies are beautiful．They come in many colors and patterns．Who doesn't like looking at these amazing insects？
Super Sizes
Dragonflies come in many sizes．The smallest one is the size of your thumbnail．The largest one would cover your face．I recently looked for the heaviest dragonfly in the world-the giant petaltail．It lives in Australia．
Built to Hunt
Dragonflies are built to hunt．They have two compound（复合的） eyes．Each eye is made of 30，000smaller eyes．All those eyes help a dragonfly see everything．A dragonfly can spot a tasty meal from up to 18feet away．
Dragonflies have six legs．The insect cannot walk on its legs，however．It uses its four wings to get around．It can fly up to thirty miles per hour，looking for food．
From Water to Air
A dragonfly begins its life underwater．It hatches （孵化）from an egg and becomes a larva．A larva is a young dragonfly．It can swim，but it cannot fly．
A larva lives in a lake or stream．It can grow for several years．Then it crawls out of the water．It sheds（脱落） its hard skin and becomes an adult．
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Dragonflies in Danger
I worry about dragonflies．People are cutting down forests where the insects live．That could cause some species to die out．I want to protect these tiny dragons for others to see and enjoy．

53．The dragonflies are built to hunt because theyD．
A．have six legs
B．walk on their legs
C．begin life underwater
D．have compound eyes
54．After reading this passage，what can we conclude about dragonflies？B
A．Dragonflies are easy to find．
B．Some dragonflies are in danger．
C．Dragonflies look like small dragons．
D．Some dragonflies can be harmful．
55．By writing the passage，the writer wants to tell usC．
A．how to photograph dragonflies
B．how to protect dragonflies
C．the life of dragonflies
D．the living habits of dragonflies．

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