Part 1 Directions: There are 5 groups of sentences below, with each group consisting of 2 sentences. Read the sentences and choose the sentence which is more appropriate in academic articles. 1. 如果我们认
A.If we don’t recognize the serious problem of waste gas, our planet will be faced with disaster
B.Failure to recognize the seriousness of waste gas will lead to a disaster for our planet
C.无
D.无