女性，73岁，因股骨颈骨折行人工全髋关节置换术，手术后3个月内可以进行的活动是（）。

鼻息肉术前影像学检查首选的检查是（）

A.CT

B.X线平片

C.PET

D.ECT

E.B超

____ you promise to buy her a gift, you can’t break it in any case.

A．Once

B．Until

C． For

D．That

Like distance runners on a measured course，all of us will move through time in a roughly predictable pattern．

In the first stage of our lives，we develop and grow, reaching toward the top of physical vitality(活力)．

After we grow up，however, the body begins a process of gradually wearing out．

A new awareness of physical fitness may help lengthen our years of health and vitality，yet nothing we do will work to stop the unavoidable force of aging．

Most of the changes of aging take place deep inside the body．The lungs become less able to take in oxygen．Powerful muscles gradually lose their strength．The heart loses power and pumps less blood．Bones grow easier to break．

Finally, we meet a stress，a stress that is greater than our physical resistance．Often，it is only a minor accident or chance infection(a disease caused by virus)，but this time，it brings life to an end．

In 1932，a classic experiment nearly doubled the lifetime of rats，simply by cutting back the calories in their diet The reason for the effect was then unknown．

Today, at the University of California at Berkley, Dr．Paul Seagle has also greatly lengthened the normal lifetime of rats．The result was achieved through a special protein limited diet，which had a great effect on the chemistry of the brain．Seagle showed that within the brain，specific chemicals control many of the signals that influence aging．By changing that chemical balance，the clock of aging can be reset．

For the first time, the mystery of why we age is being seriously challenged．Scientists in many fields are now making striking and far-reaching discoveries．

An average lifetime lasts 75 years，yet in each of us lies a potential for a longer life．If we could keep the vitality and resistance to disease that we have at age twenty, we would live for 800 years．

小题1:What does the underlined word “it” refer to?

A．Physical vitality．

B．Stress．

C．Aging．

D．Physical resistance．小题2:Which of the following is not a change of aging?

A．People gradually lose their muscle strength．

B．Bones tend to break more easily．

C．The heart loses power and pumps less blood．

D．The lungs become unable to take in oxygen．小题3:The author believes the following except that     ．

A．human's life pattern is predictable

B．physical fitness can't stop the force of aging

C．human's lifetime will last longer than 75 years

D．all of the changes of aging take place deep inside the body小题4:How did Dr．Paul Seagle lengthen the lifetime of rats in his experiment?

A．By keeping their physical fitness．

B．By cutting the calories in their diet．

C．By resetting their clock of aging．

D．By limiting the protein in their diet．小题5:What is probably the best title for the article?

A．Two Great Experiments

B．The Mystery of Human Life

C．The Breakthrough in the Study of Aging

D．Ways to lengthen Human Life

读某一时期内黄河入海口海岸变迁示意图，回答1-2题。

1．图示时期内黄河三角洲面积变化的趋势及主要原因分别是[ ]

A．逐渐增大  黄河含沙量大，大量泥沙在入海口附近淤积

B．逐渐减小  黄河入海口流水侵蚀严重

C．逐渐增大  人们在黄河入海口附近围海造陆

D．逐渐减小  为加快对外交往而开挖海岸、修建港口

2．黄河入海口附近每年都会新增许多湿地，关于湿地生态功能的说法，正确的是

①减小比热容，减小温差

②保持生物多样性

③涵养水源

④使黄河人海泥沙大大减少[ ]

A．①②

B．②③

C．③④

D．①④

有一例风湿性心脏病联合瓣膜病患者，心尖部有舒张期隆隆样杂音，以下哪一种体征对联合瓣膜病的诊断最有意义？（）

A.胸骨右缘第二肋间收缩期杂音

B.胸骨下端Ⅲ级收缩期吹风样杂音

C.心尖部舒张期震颤

D.胸骨左缘第3肋间舒张期吹风样杂音

E.P2亢进