[填空题]______is called "black carbon" pollution.

[填空题]______is called "black carbon" pollution.

[单项选择]

Witchcraft, also called black magic, is the power or practices of witches. Western people used to believe that witches had supernatural powers. they were supposed to be able to call up spirits and make them do evil things. Their special helping spirits are called "familiars", who take the form of animals, particularly cats, snakes, owls, and dogs.
Some people believed witches had the power to change into animals. This power enabled them to travel about secretly. Witches also were said to be able to fly. They flew by riding brooms or rakes, or riding magical animals. Witches had great knowledge of how to make magical potions and charms, which were used to change people’s behavior. Witches were believed to be able to see into the future. They were also believed to have the evil eye—that is, the ability to harm or kill by looking. When crops failed, horses ran away, cattle sickened, wagon broke, women miscarried, or storms destroyed house, a witch was a
A. Witches had the ability to change into animals.
B. Witches had the ability to harm or kill by looking.
C. Witches were able to see into the future.
D. Witches were able to change people into animals.

[单项选择]（　） was called the "Poet Laureate of Black."
A. James Arthur Baldwin
B. Ralph Ellison
C. Langston Hughes
D. Toni Morrison

[简答题]Black Europe

[单项选择]

Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite(无限的)density(稠密), This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist, they are difficult to observe. These are the reasons.
· No light or anything else comes out of black holes. As a result, they are invisible to a telescope.
· In astronomical terms, black holes are
A. Right
B. Wrong
C. Not mentioned

[填空题]Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.

[单项选择]
Most scientists agree that black holes exist but are nearly impossible to locate. A．black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite (无限的) density (稠密). This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist, they are difficult to observe. These are the reasons.
·No light or anything else comes out of black holes. As a result, they are invisible to a telescope.
·In astronomical terms, black holes are truly tiny. For example, a black h
A. Right
B. Wrong
C. Not mentioned