更多"The oceans, which cover nearly thre"的相关试题:
[单项选择]The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inaccessibility to us air breathers. Webb Research of East Falmouth, Massachusetts, hopes to open up much of that mystery field with a new underwater vehicle that is pushed ahead solely by the ocean itself, so it can potentially study the watery depths for years at a time. Such long-lasting detectors may someday form fleets that provide up-to-minute data for weather forecasting.
In the past, such autonomous underwater vehicles, or AUVs, have been battery powered and therefore required frequent recharges that limited their distance and depth of travel. Webb’s Slocum glider(滑翔机) hopes to solve this problem. "We conceived of a thermally powered engine to get the energy from the colder deep water of the ocean and the shallower warm water," Clayton Jones, an engineer at Webb Research, explains. "We picked out a material that undergoes a state change between those
A. explore the vastness of the sea
B. transport people faster than boats
C. measure the depths of oceans
D. provide data for predicting weather
[填空题]Space and oceans are the new world which scientists (try) ______ to explore.
[单项选择]Forests cover nearly（ ）of the United States, and they yield many valuable products.
A. a fourth
B. a third
C. half
D. two thirds
[单项选择]Which of the following is most nearly analogous in its cause and condition to the problems which the author describes as limiting the present success of African- American cinema
A. A rock-and-roll band considers its music unappealing to a mainstream audience, changes to a more palatable sound, and fails anyway.
B. An author decides that he would have a better niche in a fringe literary market, and sells his work there, but with little profit.
C. An artist decides that his oeuvre of paintings is not commercially viable, and resigns himself to make unpopular but artistically dignified work.
D. A marketing executive decides that a product won’t sell, and thus restricts its availability to a certain loyal market.
E. A film actor realizes that he could be more successful working in theater, and though he achieves success, finds he misses his old form
[填空题]Environmental management is the process by which environmental health is regulated. It does not involve managing the environment itself, but it is the process of taking steps and (36) to have a positive effect on the environment. Many companies and organizations have (37) management plans for the environment, as taking care of the (38) is the responsibility of everybody in every type of (39) .
Employees at a company or members of an organization that has been chosen to (40) an environmental management plan must be given the proper environmental training. While goals such as (41) and better methods of waste (42) are solid ideals to strive for, many of these techniques have been tried before. If everyone at the organization is not on board and using the same methods, the plan will serve no (43) good. If an environmental management plan is properly enforced, however, (44) .
Envir
