【单选题】Thefollowing sentences are from one paragraph. Decide which one is the topic sentence of the paragraph?1)In time, this melted part rises as a magma.2)The formation of a volcanic eruption is a dramatic...
【简答题】You will hear a presentation delivered by the PR Department Manager of Oracle China.Listen to the first part of the presentation and fill in the blanks. Distinguished guests, ladies and gentlemen, goo...