At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.
| A．troubled | B．confused | C．disturbed | D．puzzled |
相关试题
Her father told her to be careful when _____ the street. 
| A．he is crossing | B．she is crossing | C．crossed | D．crossing |
Hardly ________ home when he was asked to go back to work. 
| A．had he arrived | B．he had arrived | C．did he arrive | D．he arrived |
My key is gone. Have you seen it anywhere? 
– Oh, it is in the room _______ we had a talk last night
| A．that | B．which | C．where | D．what |
She was admitted to so excellent ________ university that her parents were proud of her.
| A．/ | B．a | C．an | D．the |
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