为什么被子植物会发展成为陆地上种类最多、适应类型最多的一群植物?

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问题:

为什么被子植物会发展成为陆地上种类最多、适应类型最多的一群植物?

考点:植物学植物学综合练习(一)植物学综合练习(一)题库
题型:问答题 简答题

阅读理解。

     Recently, an Internet game has become a new fashion among young office workers and students. People

can "farm" on a piece of  "land" and "grow", "sell" or even "steal" "vegetables", "flowers" and "fruits" on the Net.

They can earn some e-money and buy more "seeds",  "pets" and even "houses".

     Joyce interviewed some young people. Here are their opinions.

     Harold: I don't quite understand why they are so crazy about the childish game. Maybe they are just not

confident (自信) enough to face the real world.

      Allan: I enjoy putting some "bugs" in my friends' gardens and we've become closer because of the game.

Having fun together is the most exciting thing about it.

     Laura: You know, people in the city want to enjoy the life in the countryside. It can reduce my work

pressure (压力); besides, it gives me the exciting experience (经历) of being a "thief".

     Ivy: Well, it's just a waste of time. Students playing the game spend so many hours on it that they can't

put their hearts into their study.

1. According to the passage, people can't _____ things in this game.[ ]

A. grow

B. borrow

C. steal

D. sell

2. From Laura's words, we can guess that she's most probably _____.[ ]

A. an office worker

B. a farmer

C. a student

D. a thief

3. Which is NOT the reason why people like the game? [ ]

A. They want to enjoy the country life.

B. They can have fun with friends.

C. The game can give people an exciting experience.

D. They are confident enough to face the real world.

4. Where can you find this passage? [ ]

A. In a car magazine.

B. In an advertisement.

C. In a newspaper.

D. In a science book.

题型:问答题 简答题

下列关于政策性金融机构的说法,正确的是( )。

A.与商业银行没有区别

B.不以盈利为目的

C.由政府支持不完全以盈利为目的

D.代表国家财政

题型:问答题 简答题

三峡船闸是世界上最大的船闸,它的建造使用利用了______的原理.用吸管吸饮料时,利用了______的作用.如图所示,在两张纸片中间向下吹气,可观察到两纸片向中间靠拢,这是因为______.

题型:问答题 简答题

一般叶片泵在()×10Pa压力下工作比较合理。

A.25

B.63

C.100

D.125

题型:问答题 简答题

事务T1,T2,T3分别对数据D1,D2,D3并发操作如下图所示,其中T1与T2间的并发操作存在的问题是 (1) 。T2与T3间的并发操作
存在的问题是 (2)

时间T1T2T3
t1读D1=50
t2读D2=100
t3读D3=300
t4x1=D1+D2+D3
t5读D2=100
t6读D3=300
t7读D2=100
t8D2=D3-D2
t9写D2
t10读D1=50
t11读D2=200
t12读D3=300
t13x1=D1+D2+D3
t14验证不对D2=D2+50
t15写D2

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