Color-blind people often find it difficult to _____ between blue and green.
| A．compare | B．separate | C．distinguish | D．divide |
Most people would agree that nuclear science should be developed to benefit the human beings_______ harm them.
| A．more than | B．other than | C．better than | D．rather than |
Many new means__________ to prevent the river ____________.
| A．have found, from polluting |
| B．have found, from being polluted |
| C．have been found, from being polluted |
| D．has been found, from being polluted |
I like _____ in the spring when the weather is warm and everything begins to grow.
| A．this | B．that | C．these | D．it |
Is it to hold the 2010 World Exhibition _______ makes Shanghai the focus of the world?
| A．when | B．that | C．which | D．what |
We can never expect________bluer sky unless we create___________less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |