【单选题】Scientists have come up with a theory for why time flies when you are having fun and drags when you are bored. Scans have shown that【C1】______ of activity in the brain change depending on how we focus...
【简答题】Directions: Complete the following summary of the passage by choosing proper words you’ve learned in the passage to fill in each blank. Change the form if necessary. City-states in ancient Greece ofte...
【简答题】Democracy Democracy is not a new concept. The ancient Athenians had a democratic system. Their democracy was the same as American democracy in many ways. Nevertheless, there are several important diff...