The radiation amount of a mobile phone for two half-hour periods per day is equal to ________ to an X-ray for ten seconds.
| A．expose | B．exposing | C．exposed | D．being exposed |
____ of danger on the road at night, the girl had to go home with a friend____ her.
| A．Being warned; accompanied |
| B．Having warned; accompanying |
| C．Warning; accompanying |
| D．Having been warned; accompanying |
My laptop computer, ____ I can’t go on with my work, broke down the other day.
| A．which | B．that |
| C．without which | D．for which |
If nature doesn’t provide man with the necessary material, it is the laboratory _____ he will turn to for help.
| A．where | B．that | C．which | D．what |
Recently, to expand employment, the Chinese government has ______ a policy of encouraging college graduates to take positions in rural areas.
| A．adopted | B．admired |
| C．adapted | D．admitted |
The new tax policy only affects people on yearly incomes over $120,000, __________, the very rich.
| A．by the way | B．as a result |
| C．in other words | D．as a manner of |