Swimmers must be very strong in order to build up speed because of the high resistance (阻力)of the water. Runners,__________, must struggle against the heavy resistance of the air and ground.
| A．generally |
| B．similarly |
| C．naturally |
| D．probably |
The computer system _____ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out | C．broke up | D．broke in |
Cycling is highly _____ to people’s health and the environment.
| A．fashionable | B．beneficial | C．changeable | D．suitable |
I recognize her __I met her at the airport, although we haven’t seen each other for ten years.
| A．the moment | B．in the moment |
| C．for the moment | D．at the moment |
Unless ________ to speak, you should remain silent at the conference.
| A．invited | B．inviting | C．being invited | D．having invited |
_____ in Haikou for five years, he is not used to the weather in his hometown.
| A．Live | B．To live | C．Having lived | D．Have lived |