[填空题]There have been claims that warming on Mars and Pluto are proof that the recent warming on Earth is caused by an increase in solar activity, and not by greenhouses gases. But we can say with (47) that, even if Mars, Pluto or any other planets have warmed in recent years, it is not due to (48) in solar activity.
The Sun’s energy output has not increased since direct (49) began in 1978. If increased solar output really was (50) , we should be seeing warming on all the planets and their moons, not just Mars and Pluto.
Our solar system has eight planets, three dwarf planets and quite a few moons with at least a (51) atmosphere, and thus a climate of sorts. Their climates will be 52 by local factors such as orbital variations, changes in reflectance (反射率) and even (53) eruptions, so it would not be surprising if several planets and moons turn out to be warming at any one time.
However, given that a yea

[填空题]There have been claims that warming on Mars and Pluto are proof that the recent warming on Earth is caused by an increase in solar activity, and not by greenhouses gases. But we can say with (47) that, even if Mars, Pluto or any other planets have warmed in recent years, it is not due to (48) in solar activity.
The Sun’s energy output has not increased since direct (49) began in 1978. If increased solar output really was (50) , we should be seeing warming on all the planets and their moons, not just Mars and Pluto.
Our solar system has eight planets, three dwarf planets and quite a few moons with at least a (51) atmosphere, and thus a climate of sorts. Their climates will be 52 by local factors such as orbital variations, changes in reflectance (反射率) and even (53) eruptions, so it would not be surprising if several planets and moons turn out to be warming at any one time.
However, given that a yea

[单项选择]

There have been several claims to have cloned humans over the past few years. Most have been bogus. But the announcement made this week by Woo Suk Hwang, of Seoul National University in South Korea, and his colleagues, is serious. It is the first to achieve the accolade of publication in a peer-reviewed scientific journal. Dr. Hwang s work appears in Science.
The terminology of human development has become slippery over the past few years, in the hands of both "life-begins-at-conception" propagandists who want to stop this sort of research, and publicity-seeking scientists who have claimed more than they have really achieved. What Dr. Hwang and his team have created is not what developmental biologists would normally refer to as an embryo. But it is a genuine scientific advance. South Korea’s researchers have taken egg cells from volunteer women, removed the nuclei from those cells (which contain only half of the genetic complement required to make a human
A. Different.
B. Fake.
C. Bold.
D. Genuine.

[单项选择]Children have been said to have brain-injured child syndrome, hyperactive (极度活跃的) child syndrome and attention-deficit disorder (ADD). As early as the 1940’s, psychiatrists have (67) children with hyperactivity and extremely distracted and impulsive (冲动的). These frequent name changes show how (68) researchers are about the causes (69) the problem and the diagnostic criteria for the disorders. In the past several years, the people who (70) attention deficit hyperactivity disorder (ADHD) have (71) to clarify the disorder’s causes and (72) , and have reasons to believe that it may be genetic. Today’s view (73) this disorder is very different from the beliefs of just a few years ago. Researchers are finding that ADHD is not a disorder of just attention, but is from a developmental (74) in the brain’s circuitry and self-control. The loss of self-control (75) other important brain functions mandatory for maintai
A. develop
B. possess
C. correct
D. receive