问题 问答题 简答题

昆虫有哪些主要口器类型?主要类型间有何进化关系?

答案

参考答案:

昆虫主要的口器类型包括咀嚼式口器(具坚硬发达的上颚)、嚼吸式口器(上颚发达,下颚和下唇特化成喙)、舐吸式口器(主要由下唇特化成的喙构成)、刮吸式口器(口器仅见1对口钩,为双翅目蝇类的幼虫所特有)、虹吸式口器(上颚消失,由下颚的1对外颚叶特化成1条卷曲能伸展的喙)、捕吸式口器(上颚延长成镰刀状)、锉吸式口器(左右上颚不对称)、切舐式口器(上唇较长,上颚刀片状,下颚形成口针,下唇肥大柔软)和刺吸式口器(有口针和喙)等。

根据化石记录,主要口器的进化关系为(按口器出现的地质时期分):嚼式口器(早泥盆纪)、刺吸式口器(中石炭纪)、舐吸式口器(晚三叠纪-早侏罗纪)、嚼吸式口器、虹吸式口器等(晚侏罗纪-早白垩纪)。

阅读理解

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。(注意:涂在答题卡上,E涂 AB  F 涂 AC   G涂 AD)

Our mood may change suddenly like a storm with lightning and thunderbolts that comes without notice.

The good news is that bad moods can leave as suddenly as they have come. Exceptions to this rule of course are cases where there are other problems such as depression or any other mental destruction.

How to improve your mood?

______1_________When you understand that you are not feeling happy but you are in depression or disappointment, then you can use these simple techniques that will be able to change the negative situation and improve your mood.

______2_______. Exercises, gymnastics and sports help a lot to achieve a better emotional balance.

If you feel that you are in a bad mood, take a hot bath or sauna. _________3__________.

Watch a movie, read a book or talk to a friend.

________4__________. When you leave work or home, go to places that make you happy and calm. This helps to improve your mood.

Make relations with happy, optimistic and pleasant people. ______5_______. Positive and optimistic feelings that create positive thinking for the future will help you overcome your bad feelings and defeat your bad mood.

When the problem of bad moods, frustration and negative emotions beyond normal situations becomes chronic (长期的), it is important to turn to a specialist for help.

A.The relaxation of the muscles will help.

B.Change your environment.

C.Use physical activity to fight against feelings of depression.

D.This can help you improve your mood significantly.E. First you have to learn to recognize when you are in a bad mood.

F. There are ways to improve your mood.

G. Changes in feelings and mood can happen for various reasons.

阅读理解

“Can I see my baby?” asked the happy new mother. The bundle (a collection of things wrapped or boxed together) was placed in her arms and when she moved the fold of cloth to look upon his tiny face, she gasped -- the baby had been born without ears. Time, however, proved that the baby’s hearing was perfect except his appearance.

One day when he rushed home from school and threw himself into his mother’s arms, he cried out bitterly, “A boy, a big boy… called me -- a f... freak.” She sighed, knowing that his life was to be endless of heartbreaks.

He grew up, handsome for his misfortune. A favorite with his fellow students, he might have been class president, but for that. He developed a gift for literature and music.

The boy’s father had a talk with the family doctor. Could nothing be done? “I believe we could graft (移植) on a pair of outer ears, if they could be donated (捐献) ,” the doctor decided. So the search began for a person who would make such a sacrifice for a young man. Two years went by. Then, “You’re going to the hospital, son. Mother and I have someone who will donate the ears you need. But it’s a secret.” said the father.

The operation was a brilliant success. His talents blossomed into genius. School and college became a series of successes. Later he married and entered the diplomatic (外交) service. “But I must know!” he urged his father. “Who gave so much for me? I could never do enough for him.”

“I do not believe you could,” said the father,“but the agreement was that you are not to know…not yet.” The years kept the secret, but the day did come... one of the darkest days that ever passed through a son. He stood with his father over his mother’s casket (棺材). Slowly and tenderly, the father stretched forth a hand and raised the thick, reddish-brown hair to let out the secret.

小题1:The story is mainly about _______.

A.how a boy had new ears through an operation

B.what a devoted parent privately did for the child

C.how a disabled boy turned into a useful person

D.why a donator made a sacrifice to a bright boy小题2:From the first paragraph we know that the mother _______.

A.was determined to donate her ears to perfect her son

B.kept her husband unknown about the baby’s situation

C.felt shocked and disappointed to see her new baby

D.complained of her bad luck to have a disabled child小题3:The underlined word “freak” in Paragraph 2 is the closest in meaning to “_______”.

A.slow-acting person

B.funny-looking child

C.badly-behaved student

D.strangely-shaped creature小题4:What can be inferred from the passage?

A.The agreement was between the donator and the family.

B.The boy was so popular that he was made class president.

C.Finally the boy came to know who the donator was.

D.The mother donated her ears to her son after she died.小题5:What moral lesson can we draw from this reading?

A.Real love lies in what is done unknown rather than what is done known.

B.It is parents’ responsibility to help their children heart and soul.

C.True beauty lies only in the heart not in appearance.

D.Young generations should learn to be grateful.