_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
In dealing with public relations, we should make every effort to prevent the______ in personality.
| A．contact | B．contrast | C．connection | D．conflict |
The environmentalists said wild goats’______ on the vast grasslands was a good indication of the better environment.
| A．escape | B．absence | C．attendance | D．appearance |
Usually a child's behavior is a ________ of his family environment.
| A．recognition | B．reflection | C．return | D．record |
I have read the material several times but it doesn't make any ________ to me.
A meaning B. importance C. sense D. significance
Don’t leave matches or cigarettes on the table within ______of little children.
| A．hand | B．reach | C．space | D．distance |