(As long as) poor people, who in general are colored, are (in conflict with), richer people, who in general are (lighter) (skin), there’s going to be a constant racial conflict in the world.

A:As long as B:in conflict with C:lighter D:skin

As long as poor people, who in general axe colored, are in conflict with richer people who in general are lighter skin, there’s going to be a constant racial conflict in the world.
A. As long as
B. conflict with
C. lighter
D. skin

D，改skin为skinned。

A:thinner B:stabler C:lighter D:dimmer

Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form a crust of rock that was many miles thick.
Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.
In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.
The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents-and became the several oceans and seas we know today.

In the last sentence of the second paragraph, "the higher places on earth" refers to （　）

A:the high mountains B:the lighter rocks C:the vast ocean D:the great continent

Passage Two
What is wind You can feel it, and you can sometimes hear it, too. You can’t see the wind, but you can see all kinds of plants and flowers moving in the wind. Grass moves in the wind. So do trees. What is the wind It is moving air.
What makes the air move Think of two places. They may be close to each other, or they may be far away. The air is cold in one place. But it is hot in the other. Warm air pushes up high into the sky. It goes higher than the cold air. The colder air then moves into the place where the warmer air used to be. The moving air is wind.
Winds move clouds in the sky. A nice day can turn cloudy in a short while. Sometimes the clouds are big and dark. Big, dark clouds hold a lot of water. Soon it begins to rain.
High winds can make a storm come fast. They can make a lot of noise, too. Sometimes they sound like a train going by. Very high winds have picked up big things like cars and trucks from the ground. Some have even picked up houses!
But most winds are much lighter. You can have fun in a lighter wind ff you have a kite. Do you know how to fly one Just let the wind take the kite high into the sky.

According to the passage wind is（）

A:moving air B:lighter clouds C:air pressure D:cold air

Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form a crust of rock that was many miles thick.
Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.
In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.
The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents--and became the several oceans and seas we know today.
In the last sentence of the second paragraph, "the higher places on earth" refers to ______.

A:the high mountains B:the lighter rocks C:the vast ocean D:the great continent

Compared with very high winds, lighter winds ______.

A:are more dangerous B:are more harmful C:are more powerful D:are more welcome

Passage Three

In the last sentence of the second paragraph, "the higher places on earth" refers to ______.

A:the high mountains B:the lighter rocks C:the vast ocean D:the great continent