4. A business operated by two or more people as co-owners is known as ______

2. 我认识他已有20年了。 A: I have known him for more twenty years. B: I have know him for more than twenty years. C: I have known him for more than twenty years.

Of all the elements in the Earth's crust, oxygen is known to be the more common.（） A: Of all B: elements C: to be D: more

The benefit someone gets from consuming one more glass of lemonade is known as the

Scientists are pushing known technologies to their limits in an attempt to ________ more energy from the earth.

Some cultures such as United States, Australia tend to place more inportance on the , they are known as or .

________________ are more commonly known as 'mind-enhancing drugs' or 'smart drugs'. A plethora of drugs are already known to cause a variety of effects on the brain, e.g., the stimulatory action of caffeine.

John Blanchard and Miss Maynell had known each other for more than 12 months.

中国大学MOOC: In coarticulation, if the sound becomes more like the following sound, as inlamb, it is known as.

As is known to all, trade and specialization go hand in hand and enable each of us to have more products to use.