[填空题]There is evidence that "Frankenstein food" has had adverse health effects on consumers.

[填空题]There is evidence that "Frankenstein food" has had adverse health effects on consumers.

[填空题]The opinion that "Frankenstein foods" have had adverse health effects on consumers lacks enough ______.

[填空题]

conglomerate has had decided to purchase a European firm. "The best acquisitions in the United States have already been picked, " the president told the board of directors. "However, I’m

[单项选择]

Organic food has no nutritional or health benefits over ordinary food, according to a major study.
Researchers from the London School of Hygiene & Tropical Medicine said consumers were paying higher prices for organic food because of its imagined health benefits, creating a global organic market worth an estimated $48 billion in 2007.
A systematic review of 162 scientific papers published in the scientific literature over the last 50 years, however, found there was no significant difference.
"A small number of differences in nutrient content were found to exist between organically and conventionally(通常)produced foodstuffs, but these have nothing to do with public health, " said Alan Dangour, one of the report’s authors.
"Our review indicates that there is currently no evidence to support the selection of organically over conventionally produced foods on the basis of nutritional superiority. "
The results of res
A. Because people think they are much healthier.
B. Because they are more delicious
C. Because people prefer organic food.
D. Because they sell better.

[简答题]Relativity theory has had a profound influence on our picture of matter by forcing us to modify our concept of a particle in an essential way. (46) In classical physics, the mass of an object had always been associated with an indestructible material substance, with some "stuff" of which all things were thought to be made. Relativity theory showed that mass has nothing to do with any substance, but is a form energy. Energy, however, is a dynamic quantity associated with activity, or with processes. (47) The fact that the mass of a particle is equivalent to a certain of energy means that the particle can no longer be seen as a static _object, but has to be conceived as a dynamic pattern, a process involving the energy which manifest itself as the particle’s mass.
(48) This new view of particles was initiated by Dirac when he formulated a relativistic equation describing the behavior of electrons. Dirac’s theory was not only extremely

[填空题]Everyone has had this experience of losing attention, but probably few people understand one of the main reasons why we have this trouble keeping our attention on the speaker. The reason is this: There is a great deal of difference between talking speed and listening speed. The result of this gap is that we have a lot of (36) time to use while listening to a (37) .
Here are three mental techniques you can use to keep your (38) on the speaker. First of all, (39) what the speaker has said. Do this after each new point is developed. This (40) summarizing will help you pay attention. Second, try to guess where the speaker is going next. Try to (41) what direction the speaker is going to take, based on what has already been said. This game you play with yourself arouses your curiosity and helps (42) your attention. Third, question the truth, the (43) , of the speaker’s words. Keep trying to decide