题目内容
（请给出正确答案）
Two nuclear power stations __________in the past ten years.
A.have been built
B.built
C.would be built
D.are built
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更多“Two nuclear power stations ___…”相关的问题
Two nuclear power stations _______ in the past ten years.
A.are built
B.have been built
C.would be built
D.are building
A．presentation
B．precaution
C．preparation
D．prediction
The nuclear family ____ two parents (mother and father) and their children.
A: consists of
B: consist of
C: is consisted of
D: consists
A.in compared with
B.in compared to
C.compared with
D.compared to
Some nuclear families, however, may add one or more grandparents to come to live with them, that is three generations. This kind of family with grandparents, parents, and grandchildren is called an extended family. This family type was not very common during the later half of the twentieth century, but it's becoming more common now as an elderly grandparent moves in to live with a son or daughter. This is more possible now that American homes have become larger. What is interesting, however, is that after the grandchildren move out of the home and start their own families, this extended family shrinks back to a nuclear family, with just two generations again living together, a grandparent and parents, with the grandchildren coming only for occasional visits.
Now, the fatherless or motherless family is one kind of what we call a single-parent family. In the fatherless family it's just the mother and her children. As I said, this can be the result of the husband's death, of an unmarried mother, of a separation or divorce. There are also a growing number of motherless families--where the father raises the children, for any of the same reasons. A motherless family may also be fatherless, but still a family with one adult. This is becoming more common in the big cities where a grandmother will raise her daughter's children while the daughter goes elsewhere to work.
One other new kind of family is becoming increasingly more common. A single parent with one or more children will marry again. Perhaps the other parent is also a single parent. Together they will start what is called a blended family, which blends together or combines the children from two other families.
An extended family usually has ______.
A．two generations
B．three generations
C．four generations
D．one generation
（) can provide an asynchronous link between two ac electric power system with different nominal frequencies.
A.The HVDC (high voltage DC) transmission
B.The EHV (extra-high voltage) AC transmission
C.The AC distribution
D.Generators
By the time he arrives in Beijing, we ______here for two days.
A．will have stayed
B．shall stay
C．have been staying
D．have stayed
What is the typical American family (21) ？ Married American adults will name their husband or wife and their children (22) their "immediate family"(直系家庭). If they (23) their father, mother, sisters, or brothers, they will define them as separate units, usually (24) in separate households. Aunts, uncles, cousins, and grandparents are (25) "extended family"(扩大的家庭).
The structure of the American family has undergone great changes (26) the 1950s. Traditionally, the American family (27) been a nuclear family, consisting (28) a husband, a wife, and their children. Grandparents (29) live in the same home with their (30) sons and daughters.
In the 1950s, 70 percent of American households (31) the "classic" American family—a husband, wife, and two children. The father earned the money to 32 the family, the mother (33) the children and did not work outside the home, and they had two children.
Yet, in the 1990s,only 8 percent of American households consisted of a (34) father, a stay-at- home mother, and two children. And 35 ,18 percent of households consisted of two parents who were both working and some or more children living at home.
21.
A. likes
B. liking
C. like
D. look like
Asteroids are different forms of the meteoroids that race across the night sky. Most orbits the sun far from Earth and don't threaten us. But there are also thousands of asteroids whose orbits put them on a violent coming course together with Earth.
Buy $ 50 million worth of new telescopes right now. Then spend $10 mil]ion a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we'll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap.
Is it worth it？ Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think asteroids big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare but if one did fall it would be the end of the world. "If we don't take care of these big asteroids, they'll take care of us. "Says one scientist. "Its that simple."
The cure, though, might be worse than the disease, Do we really want fleets of nuclear weapons silting around on Earth？ "The world has less to fear from doomsday rocks than from a great nuclear fleet set against them. "Said a New York Times article.
What does the passage say about asteroids and meteoroids？
A．They are heavenly bodies similar in nature.
B．There are more asteroids than meteoroids.
C．They are heavenly bodies different in composition.
D．Asteroids are more mysterious than meteoroids.
