某气态烃0.5mol能与1molHCl完全加成,加成后产物分子上的氢原子又可被3

题型:选择题

问题:

某气态烃0.5mol能与1molHCl完全加成,加成后产物分子上的氢原子又可被3molCl2取代,则此气态烃可能是(   )

A.CH≡CH

B.CH≡C-CH3

C.CH2=CH2

D.CH2=C(CH3)2

考点:结构简式结构式
题型:选择题

本病诊断是

A.多发性室性期前收缩

B.心房颤动

C.心房扑动

D.室上性心动过速

E.室性心动过速

题型:选择题

在表示自动控制系统的方块图中,任何一种复杂的方块图都是由()等基本形式组成的。

A.反馈

B.串联

C.并联

D.混联

题型:选择题

阅读理解。

    Wild animals seem to have escaped the Indian Ocean tsunami (海啸), adding weight to

ideas they possess a "sixth sense" for disasters, experts said on Thursday.

    Sri Lanka wildlife officials have said the giant waves that killed over 24,000 people

along the Indian Ocean island's coast seemingly missed wild beasts, with no dead animals

found.

    "No elephants are dead, not even a dead hare or rabbit. I think animals can sense

disaster. They have a sixth sense. They know when things are happening," H.D. Ratnayake,

deputy director of Sri Lanka's Wildlife Department, said on Wednesday.

    The waves washed floodwaters up to 3 km (2 miles) inland at Yala National Park in the

southeast, Sri Lanka's biggest wildlife reserve and home to hundreds of wild elephants.

"There has been a lot of evidence about dogs barking or birds migrating before volcanic

eruptions or earthquakes. But it has not been proven," said Matthew van Lierop, an animal

behaviour specialist at Johannesburg Zoo.

    "There have been no specific studies because you can't really test it in a lab or

field setting," he said.

    Other authorities agreed with this conclusion.

    "Wildlife seem to be able to pick up certain phenomenon, especially birds. There are

many reports of birds detecting coming disasters," said Clive Walker, who has written

several books on African wildlife.

    Animals certainly rely on the known senses such as smell or hearing to avoid danger

such as predators (食肉动物).

    The idea of an animal "sixth sense" is a lasting one that the evidence on Sri Lanka's

damaged coast is likely to add to.

1. This passage is mainly about ______. [ ]

A. the damage that was caused in the Indian Ocean tsunami

B. why animals can save them from natural disasters

C. how to protect the wildlife when disaster happens

D. the different opinions about animals' natural power

2. Which of the following is true according to the text? [ ]

A. It has been proved that animals have a "sixth sense".

B. Research has been made on the special movements of animals before disasters.

C. It's generally considered that animals can sense the coming of disasters.

D. Animals have depended on the known senses to escape the Indian Ocean tsunami.

3. What does the term "sixth sense" in the text means? [ ]

A. It is the natural ability of animals that can save them from danger.

B. It is the animal's imagination in the brain.

C. It is some hidden power to say in advance that something will happen.

D. It is a kind of sense that is the same as smell or hearing.

4. Which section does the text most probably appear in a newspaper? [ ]

A. News Report.

B. Discovery.

C. Science Fiction.

D. Culture.

题型:选择题

根据《中华人民共和国税收征收管理法》的规定,税务机关可以采取的税款征收措施不包括( )。

A.责令缴纳并加收滞纳金
B.核定调整应纳税额
C.取消税收优惠
D.采取税收保全措施

题型:选择题

大多数的对预算,时间表和资源分配的统计模拟利用了哪种方式?()

A、计划评审技术

B、决策树

C、现值分析

D、蒙特卡罗分析

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