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A proverb allegedly from ancient China was widely spread in the West: "If you want to be h

appy for a few hours, go to get drunk; if you want a lifetime happiness, take up gardening. " The reason for the last option is this: Gardening is not only useful, but it helps you to identify yourself with nature, and thus brings you new joy each day besides improving your health.

A research of a US university that I've read gives a definition of happiness as what makes a person feel comfortably pleased. To put it specifically, happiness is an active state of mind where one thinks one's life is meaningful, satisfactory and comfortable. This should be something lasting rather than transitory.

Lots of people regard it the happiest to be at leisure. But according to a study, it is not a person with plenty of leisure but one at work that feels happy, especially those busy with work having little time for leisure. Happiness does not spell gains one is after but a desire to harvest what one is seeking for. People often do not cherish what they already have but yearn for what they cannot get. That is somewhat like a man indulging in fond dreams of numerous lovers while reluctant to settle down with the woman beside him.

Happiness is a game balancing between two ends—what one has and what one wishes for, e. g. one's dream and the possibility to realize it. The study comes to this conclusion: A happy man is one who aims high but never forgets his actual situation; one who meets challenges that tap his ability and potentiality; one who is proud of his achievements and the recognition given to him. He has self-respect and self-confidence; treasures his own identity and loves freedom. He is sociable and enjoys wide-range communication with others; he is helpful and ready to accept assistance. He knows he is able to endure sufferings and frustrations; he is sensible enough to get fun from daily chores. He is a man capable of love and passion.

According to the passage, gardening can bring lifelong happiness because______.

A.gardening is a profitable business

B.it can strengthen gardener's ability to remake nature

C.gardener can enjoy very happy marriage

D.gardener can build good relationship with nature

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第1题

2,3-DPG含量变化的意义描述错误的是()

A.当2,3-DPG含量升高时,血红蛋白与之结合增加,而与氧的亲和力下降

B. 当2,3-DPG含量升高时,血红蛋白与之结合下降,而与氧的亲和力升高

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E. 2,3-DPG含量可反映某些酶的缺陷

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第2题

2,3-DPG可调节血红蛋白对氧的运输,下列说法不正确的是 ()A、当2,3-DPG含量升高时,血红蛋白与

3-DPG可调节血红蛋白对氧的运输,下列说法不正确的是 ()

A、当2,3-DPG含量升高时,血红蛋白与之结合增加,与氧的亲和力下降

B、当2,3-DPG含量升高时,血红蛋白与之结合减少,与氧的亲和力升高

C、2,3-DPG含量测定可以用来反映某些酶的缺陷

D、2,3-DPG含量测定可以用来反映血液贮存情况

E、2,3-DPG含量测定可以用来反映组织缺氧的程度

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第3题

3-DPG可调节血红蛋白对氧的运输,下列说法不正确的是 ()

A、当2,3-DPG含量升高时,血红蛋白与之结合增加,与氧的亲和力下降

B、当2,3-DPG含量升高时,血红蛋白与之结合减少,与氧的亲和力升高

C、2,3-DPG含量测定可以用来反映某些酶的缺陷

D、2,3-DPG含量测定可以用来反映血液贮存情况

E、2,3-DPG含量测定可以用来反映组织缺氧的程度

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第4题

动脉血氧含量的影响因素为 ()

A.PaCO2

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D.2,3-DPG的含量

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第5题

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粉煤灰水泥抗腐蚀性能优于硅酸盐水泥是因其水泥石中____。

A.

B. Ca(OH)2含量较低,结构较致密

C. Ca(OH)2含量较高,结构不致密

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第6题

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第7题

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A.Ca(OH)2含量较高,结构较致密 B.Ca(OH)2含量较低,结构较致密

C.Ca(OH)2含量较高,结构不致密

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