问题 选择题

有种子的植物又可以划分为两个不同的类群,它们是(  )

A.单子叶和双子叶植物

B.被子和裸子植物

C.有茎和无茎植物

D.有叶和无叶植物

答案

种子植物都能产生种子,用种子繁殖后代,受精过程不需要水.根据种子是否有果皮包被,种子植物可分为裸子植物和被子植物.裸子植物的种子裸露着,没有果皮包被.被子植物的种子的有果皮包被.种子植物都具有根、茎、叶.被子植物分为单子叶植物和双子叶植物.

故选B.

阅读理解

阅读理解。

     People have sailed (航行) around the world in quite small boats.  It is not an easy thing to do.

Sometimes the weather gets bad.  That can be the end of a boat, and the end of everyone in it.  

Accidents can happen easily and quickly.

     One family once had an accident with some big fish.  The fish swam under their boat and bit (咬) holes

in it.   The sea water came in,  of course,  and the boat soon sank (沉没).  Hr,  these people had another

small boat-a lifeboat,  and they all got into that.  They lived and hoped for many days.  They ate and

slept, and they always hoped.  At last a ship found them.

     How do people live in a very small lifeboat? Perhaps for weeks or months? They must be strong in

every way. They must have hope-they want to live. But you cannot cat and drink hope.

     You cannot drink sea water. Drink a lot of sea water and you will quickly die. Sailors (海员)  can

drink rain water. They must catch rain water in their boat. They must also catch fish and birds for food.  

Lifeboats do not carry a cooker (炊具), and so the sailors cannot cook their food.  Raw fish (生鱼) and

bird meat is not very nice. But there is no other choice in a lifeboatl The sailors must eat

raw food, or they will die.

     What do people think about in a life boat'l They think about land, a warm bed,dry clothes, fresh water and food, food, food.

1. When sailors' boat sinks, their lifeboat gives them _________.

A. food  

B. beds    

C. rainwater  

D. hope

2. One famil'y once had an accident at sea,  because _________.

A. their boat was caught in bad weather

B. the boat knocked against (对着) a rock and sea water came in

C. some fish bit through the bottom of their boat

D. one of them knew how to sail in the sea

3. Sailors can catch _________ for food and drink at sea in a lifeboat.

A. rain water                        

B. fish and birds

C. both sea water and rain water      

D. both A and B

4. Lifeboats do not often carry a cooker, which is _________.

A. something used for cooking  

B. food for cooking

C. a large box                

D. a person who cooks food

5. Which of the following is NOT true?

A. Sailing around the world in quite small boats is not easy.

B. All the food sailors have in a lifeboat is cooked fish and bird meat.

C. Anyone who drinks a lot of sea water will die.

D. No one can live for weeks in a lifeboat unless (除非) hc is strong and wants to live.

单项选择题