Some biologists believe this is an ancient survival strategy, _______ a diet with 30 percent
fewer calories than usual increased life span.
| A．for which | B．to which | C．of which | D．in which |
We look forward to the day when the car will be replaced by some less dangerous_______ of transport.
| A．methods | B．means |
| C．manners | D．ways |
The news that China is _________ its family planning policy has caused a heated discussion in China, and the new policy will _________ about 15 to 20 million people, only half of whom are actually willing to have a second child.
| A．relaxing; apply to | B．loosening; adjust to |
| C．arguing; refer to | D．delivering; adapt to |
Nearly three months had gone by _________ the seriously injured girl showed a slight sign of recovery.
| A．until | B．before |
| C．since | D．after |
The young backpacker always ____________ at the youth hostel when he’s in Kathmandu.
| A．puts up | B．sets down |
| C．come about | D．takes up |
The ____________ of news that a flood is coming is a staff working in the weather bureau.
| A．resource | B．origin |
| C．root | D．source |