科目: 來(lái)源:廣東省模擬題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:同步題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:同步題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:同步題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:同步題 題型:閱讀理解
A. One type.
B. Two types.
C. Three types.
D. Four types
查看答案和解析>>
科目: 來(lái)源:廣東省期末題 題型:閱讀理解
1.What does the passage mainly talk about?
A.Anatural emotion of anger.
B.Consequences of anger.
C.Control of anger.
D.Possible solutions to anger.
2.According to Paragraph 1, anger is a feeling that can lead to______.
A.It helps us find a way to correct wrongs.
B.It's a perfectly healthy feeling.
C.We should control it.
D.We have a good reason to show it
查看答案和解析>>
科目: 來(lái)源:廣東省期中題 題型:閱讀理解
You're in a bit of a dilemma standing in front of the produce section of your local supermarket.
In one hand, you're holding a conventionally grown Granny Smith apple. In your other hand, you
have one that's been organically grown. Both apples are firm, shiny and green. Both provide vitamins
and fiber, and both are free of fat, sodium and cholesterol.
The conventionally grown apple costs less and is a proven family favorite. But the organic apple
has a label that says "USDA Organic". Does that mean it's better? Safer? More nutritious? Become
a better informed consumer for your next trip to the supermarket. Several differences between
organic and non-organic foods exist. The word "organic" refers to the way farmers grow and process
agricultural products, such as fruits, vegetables, grains, dairy products and meat. Organic farming
practices are designed to encourage soil and water conservation and reduce pollution. Farmers who
grow organic produce and meat don't use conventional methods to fertilize, control weeds or prevent
livestock disease.
Here are other differences between conventional farming and organic farming:
* Organic or not? Check the label
The U.S. Department of Agriculture (USDA) has established an organic certification program
that requires all organic foods to meet strict government standards. These standards regulate how
such foods are grown, handled and processed. Any farmer or food manufacturer who labels and
sells a product as organic must be USDA certified as meeting these standards. Only producers who
sell less than $5,000 a year in organic foods are exempt(免除) from this certification.
If a food bears a USDA Organic label, it means it's produced and processed according to the
USDA standards. The seal is voluntary, but many organic producers use it.
4. Which of the following methods belongs to organic farming?
查看答案和解析>>
科目: 來(lái)源:上海模擬題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:山東省模擬題 題型:閱讀理解
查看答案和解析>>
科目: 來(lái)源:同步題 題型:閱讀理解
"The world's oceans are slowly getting more acidic."say scientists.The researchers from California
report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere.
The lowering of the waters'pH value is not great at the moment but could cause a serious threat to
current ocean life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence
Livermore National Laboratory, report their concerns in the journal Nature.
Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be
absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the
oceans have already become slightly more acidic over the last century.
These researchers have tried to predict what will happen in the future by combining what we know
about the history of the oceans with computer models of climate change."This level of acidity will get
much more extreme in the future if we continue releasing COZ into the atmosphere," said Dr Caldeira.
"And we predict the amount of future acidity will exceed(超過(guò))anything we have seen over the last
several hundred million years, let alone perhaps after rare disastrous events such as asteroid(小1j-%+)
impacts."
However, it is not absolutely clear what that means for ocean life.Most organisms live near the
surface, where the greatest pH change would be expected to occur, but deep-ocean life forms may
be more sensitive to pH changes.Coral reefs and other organisms whose shells contain calcium carbonate(小行星) may be particularly affected if the water's acidity levels keep going up, the team predict. They
could find it much more difficult to build these structures in water with a lower pH.
In recent years some people have suggested storing carbon dioxide from power stations in the deep
ocean as a way of dealing with global warming.But Dr Caldeira said that such a strategy should now be
re-considered. "Previously, most experts had looked at ocean absorption of carbon dioxide as a good
thing一because in releasing CO2 into the atmosphere we warm the planet, and when CO2, is absorbed
by the ocean, it reduces the amount of greenhouse warming."
A. the lower water pH value
B.the warming atmosphere
C.the higher level of COZ in the air
D.the increasing use of oil fuels
查看答案和解析>>
百度致信 - 練習(xí)冊(cè)列表 - 試題列表
湖北省互聯(lián)網(wǎng)違法和不良信息舉報(bào)平臺(tái) | 網(wǎng)上有害信息舉報(bào)專區(qū) | 電信詐騙舉報(bào)專區(qū) | 涉歷史虛無(wú)主義有害信息舉報(bào)專區(qū) | 涉企侵權(quán)舉報(bào)專區(qū)
違法和不良信息舉報(bào)電話:027-86699610 舉報(bào)郵箱:58377363@163.com