The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
| A．set up | B．put down | C．keep up | D．lay down |
相关试题
With the country’s population increasing to 1.3 billion, many of China’s rivers, including the legendary Yellow River, .
| A．is drying up | B．will be drying up | C．h ad dried up |
D．are drying up |
I’m into the video game, it’s hard to think of anything else. All my focus is on finishing 
the story line.
| A．Unless | B．Once | C．Whether | D．Although |
We live in a world that is changing fast, one changes come at what seems to be an ever-increasing pace.
| A．Unless | B．Once | C．Whether | D．Although |
Panda is one of remaining endangered animals in the world.
| A．The; The | B．A; a | C．The; a | D．不填；the |
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