Some people suggest that a country should try to produce all the food for its population and import as little food as possible. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 ...
"We've had several periods in recent years in which renewables have provided a big percentage of the total energy consumption. Basically, we are undergoing a huge energy transition in Greece." The thumping sound of the giant blades can be heard throughout Greece's hills, ...
You don’t realize how much clutter you have until you have to move it. I would recommend people pretend they have to move and evaluate what they would really want to take with them. A lot of what we have requires not only more money to maintain, but more work, more energy, and ...
The perceptions of nuclear energy of, I think, a whole generation has been shaped by high impact events, most notably the Chernobyl disaster… including myself. I havevivid memoriesof how the media reported on this event and how scary...
Humans naturally exhale this colorless gas, but breathing in too much of it is hazardous to your health. On Earth that usually isn't a problem because plants absorb CO2. Yet gardening space is limited on the ISS, which forced engineers to devise other means of removing excess carbon dioxide...
One way to compare lamps is by looking at how much energy they need (measured in watts) to produce the same amount of brightness (measured in lumens). Dividing these two numbers, we get the number of lumens each lamp can produce for a single watt of energy. Looking at the chart here,...
Batrachotoxin is the same poison found in dart frogs, and while it is to be avoided as much as possible, it isn't life-threatening to humans. Interestingly enough, the source of these birds' toxicity is thought to be their diet, with the Hooded Pitohui feasting on beetles from the genus...
The human (人类) body needs energy, which is provided by the food we eat. But how much do we need to stay healthy? Calories (卡路里) usually decide the energy value (价值)of food. To raise the temperature of 1 g of water by 1℃ needs one calorie. The number of calories people ...
专业英语四级模拟试卷681 (题后含答案及解析) 题型有:1. DICTATION 2. LISTENING COMPREHENSION 3. LANGUAGE KNOWLEDGE 4. CLOZE 5. READING COMPREHENSION 6. WRITING PART I DICTATIONDirections: Listen to the following passage. Altogether the passage will be read to you four times. During the first read...
If you have asex intercourse2-3 times a day, the amount of sperm will be much less than it is when you have only one orgasm a day. But don't experience sexual continence longer than for 3 days. It will not help to improve sperm production; this fact is just a prejudice. ...