1 . His behavior was_______as a challenge to his boss.

A．known

B．admitted

C．regarded

D．praised

2 . 阅读下面句子，根据句意，从方框中选择恰当的词或词组，并用其正确形式填空。

have an impact on                    boil down to                                 leave out significant                           boost             for instance             be known as

1. Anne Sullivan was a superb teacher who ________________ Hellen Keller.
2. Susan’s success in business ________________ her determination and bravery.
3. They’re building new hotels in order to ________________ tourism in this area.
4. John explained the case to his boss, being careful not to ________________ any important details.
5. The discovery of the new drug is of great ________________ to people suffering from heart disease.
6. We made many improvements to our house. ________________, we painted the walls and bought a sofa.
7. In the third mass extinction, which ________________ the “Great Dying” now, more than 90% of all species died out.