右心衰竭引起组织水肿的原因是 （ ）

下列关于腹部触及一包块的叙述，正确的是( )

A.应注意包块的部位、大小、形态、质地、压痛、活动度、有无搏动及与腹壁的关系

B.应注意包块的大小、有无血管杂音、硬度、活动度及压痛

C.注意包块有无移动性浊音、部位、大小、形态、质地、压痛及活动度

D.注意包块有无振水音、大小、部位、压痛及腹壁关系

E.注意有无蠕动波、波动感、部位、压痛及腹痛

唐代提出“文章合为时而著，歌诗合为事而作”创作主张的诗人是( )

A.李白

B.杜甫

C.王维

D.白居易

I got to the cinema and saw that the film ______ .

A. already started

B. had already started

C. starts

D. had been started

不属于咀嚼肌的是( )

A.咬肌

B.翼内肌

C.翼外肌

D.颞肌

E.颊肌

判断组织兴奋性高低的指标是( )

A.阈电位

B.时值

C.阈强度

D.刺激持续的时间

E.刺激的频率

The test ______, we began our holiday.

A. was finished

B. finishing

C. was finishing

D. finished

微分方程y′-3y =O的通解为______.

第 24 题 邓小平理论形成的时代特征是（　　）

A．战争与革命

B．和平与发展

C．新科技革命和经济全球化

D．经济全球化和政治多极化

What is the 'biggest city in the world? That is, (21) city has the largest population? This seems like (22) question to answer, but actually it isn't.

It's actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.

The second reason that it is difficult to 25 the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an (27) of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.

So we can say that these are our two (29) for comparing the populations of cities: one, it's difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

21. A. what

B. which

C. where

D. how