单选题 The most pressing problem that any country faces is how to use its scarce natural resources.
  • A. puzzling
  • B. difficult
  • C. terrifying
  • D. urgent


【正确答案】 D
【答案解析】[解析] puzzling：让人疑惑的、费解的、令人感到莫名其妙的；difficult：困难的、艰难的；terrifying：可怕的、极大的；urgent：急迫的、紧急的，和pressing意思相同。