第二部分：英语知识运用（共两小节，共45分）
第一节：单项填空（共15小题;每小题1分,共15分）
21. The sign _____ “In case of _______ fire, break the glass and press _______ red button.”
A．reads,不填；the B．writes,不填；the
C．reads,the; the D．writes,a; a
22.China's icebreaker Xuelong ______ by heavy floes since Friday after rescuing passengers on a Russian vessel stranded in Antarctica.
A. has been trapped B. had been trapped
C. has trapped D. was trapped
23. Chinese smartphone maker Xiaomi Corp said____ it sold 18.7 million smartphones in 2013, up 160 percent year-on-year, and _____ it officially expanded to Singapore ____Jan 1, in a bid to enter the global market.
A. that, that, in B. 不填, 不填, on
C. that, 不填, in D. 不填, that ,on
24. 14．Today，we'll discuss a number of cases________parents have much difficulty in communicating with their
