[填空题]Plant species are dispersed over a large area with the help of ______.

[填空题]Plant species are dispersed over a large area with the help of ______.

[填空题]The short-lived, rapidly dispersed species are often called ______.

[单项选择]A supermarket is a large-area, low-cost, high-volume, self-service operation designed to serve the consumers’’ various needs for food, clothes and other useful products in our daily life. A supermarket store can be independently owned, although most supermarket stores are operated by supermarket chains. Supermarkets have moved in several directions to further build their sales volume. They have opened much larger stores, with today’’s selling space occupying about 18,000 square feet as compared to 11,700 square feet in the 1950s. Most of the supermarket chains now operate fewer but larger stores. Supermarkets deal in a great number and variety of items. A typical supermarket handled 3,000 items in 1946 and now handles around 8,000. Nowadays, supermarkets have been hit hard by a number of competitors meeting better defined customer needs with respect to the variety of products and price levels. So they are trying to improve their marketing positions. The most important increas
A. fewer but larger stores
B. more but smaller stores
C. more and larger stores
D. fewer and smaller stores

[单项选择]Although they plant trees in this area every year, the tops of some hills are still （）.
A. blank
B. hollow
C. vacant
D. bare

[填空题]A wind plant located in an agricultural area can boost cropland rents and prices by as much as______.

[简答题]One should not plant a garden that is too large for him to care for. (Line 1, Paragraph 5, Passage 1)

[填空题]In the turnkey plant area, ______has little experience
A. A．eastern enterprise
B．western enterprise
C．local supplier

[填空题]Up till now we (plant)（）over 23,000 fruit trees.

[单项选择]In the turnkey-plant area, ______ has little experience.
A. eastern enterprise
B. western enterprise
C. local supplier

[单项选择]I don’t know why UFOs are never sighted over large cities by hordes of people. But it is consistent with the idea that there are no space vehicles from elsewhere in our skies. I suppose it is also consistent with the ideas that space vehicles from elsewhere avoid large cities. However, the primary argument against recent extraterrestrial visitation is the absence of evidence.
Take leprechauns. Suppose there are frequent reports of leprechauns. Because I myself am emotionally predisposed in favor of leprechauns, I would want to check the evidence especially carefully. Suppose I find that 500 picnickers independently saw a green blur in the forest. Terrific. But so what This is evidence only for a green blur. Maybe it was a fast hummingbird. Such cases are reliable but not particularly interesting.
Now suppose that someone reports: "I was walking through the forest and came upon a convention of 7000 leprechauns. We talked for a while and I was taken down into their hole in the
A. one should not believe anything uninteresting
B. one should not believe anything which doesn’t occur in big cities
C. one should not be too ready to believe things before checking the evidence
D. one should not expect anything strange to occur in the sky over the big cities