反应2SO2+O2⇋2SO3，5s内SO3的浓度增加了0.4mol/L，则在这段时间内用O2表示的反应速率（mol/L·s）为（）

The last sentence in Paragraph 2 "so they go out on their own. "means that ______.

A．women are going out alone

B．women are opening their own enterprises

C．they are wearing their own coats

D．it's difficult for them to become chairmen

A.HCI和NaOH

B.O 2和NaOH

C.H2SO4和Fe203

D.Hz SO 4和B aCl 2

The purpose of Paragraph 2 is to ______.

A．show privatized water is world's direction to solve water crisis.

B．explain why $37 billion will be invested to solve the problem of water shortage in Saudi Arabia.

C．show Saudis consumed too much water even though Saudi Arabia is the driest parts of the globe.

D．call for government to find more solutions for water conservation.

From Paragraph 2, we can infer that ______.

A．SF is only too powerful to speed up social changes.

B．SF's models affect the lifestyles of some individuals.

C．SF serves as a social laboratory for vivid imagination.

D．SF's predictions may not so accurate as anticipated.

n recent years but there's been a striking increase in the prison population, And because populism is coming so much to (1)_____ the political agendas, politicians are advocating sharp increases in penalties to take (2)_____ of public unease. The question is how far this will get. In the 21st century weak governments might try to win legitimacy by being especially (3)_____ on crime. That could mean high prison populations and draconian (4)_____ such as those adopted in the United States in recent years.

Luckily, there remain significant differences between the UK and the USA: social divisions are less extreme and racial (5)_____ are not as high. (6)_____ there is a great deal of minor violent crime here, rates of murder—(7)_____ particularly fuel public anxieties—are much (8)_____ because guns have not been so widely (9)_____. It's unlikely that this will change greatly: the (10)_____ to tighten up the gun laws in Britain will continue, and all (11)_____ the toughest criminals will still have a view about what is and what isn't "acceptable violence".

So I don't believe we will see a huge (12)_____ in violent crime, but I (13)_____ rates of property crime and crimes of opportunity to remain high. There will also be much more electronic fraud because it's so hard to (14)_____ and prevent. This is an important problem for business, but not one that (15)_____ much popular agitation.

It's unlikely we'll see the return of the death penalty: the police are (16)_____ about its effectiveness and its reintroduction would be highly problematic (17)_____ the recent Council of Europe protocol outlawing its use. (18)_____ punishment remains a pretty accurate temperature gauge, though: (19)_____ there is significant political pressure for the death penalty, it's a (20)_____ of harsher attitudes towards crime generally.

A．govern

B．dominate

C．control

D．manipulate

A.It's so fat

B.It's so tall

C.It's so cute

he best-known sports in the world. It all began in 1891.

Dr. James A. Naismith, the father of basketball, was an instructor at a YMCA(基督教) Training school. The school trained people to work in YMCAs. Officials at the school were concerned about the low attendance during the winter months. They felt that people didn't attend then because the school did not have a good winter sports program. So they asked Dr. Naismith for help. He came up with a new indoor game.

Naismith studied current games. He found that all the most popular games used a ball. So a ball would be a part of his new game, he decided. But kicking the ball or hitting it would be too rough for indoor. So he put 2 peach baskets up on poles. The players had to try to throw a soccer ball into them. Naismith then made thirteen rules for the game. 12 of them are still in use today. Just 7 years after the game began, professional basketball teams were formed.

And that's how basketball was born.

Which of the following would be the best title for the passage？

A．The Birth of Basketball

B．YMCA and Basketball

C．Basketball——an Indoor Game

D．A Winter Sports Program

A.so as not to miss

B.not so as to

C.so as not to be missing

D.not So as to be missing

It's really kind ______

A．of you to say so

B．for you to say so

C．of you saying so

D．for you saying so

A.like B.in C.around D.to E.toward

When it comes _____1 gravity,the larger an object is,the stronger its force is.A person creates gravity but not enough to pull objects ____2 him or cause things to go into orbit ___3 him.On the other hand,a planet has enough gravity to pull objects into orbit around it.A star makes enough gravity that it can pull whole solar systems into its orbit,____4 ours.Our sun's gravity is so strong that it keeps an object-Pluto-that is roughly 3.7 billion miles away____5 orbit.

A.s soon as

B.ven though

C.so that