B. Carnival Greeters.

　　C. Crowd Control Assistants.

　　D. Game Leaders.

　　59. Before becoming a volunteer, you must ______.

　　A. pass an interview

　　B. receive the skill training

　　C. fill up an application form online

　　D. submit a signed parental agreement form

　　60. We learn from the advertisement that a 13­year old boy ______.

　　A. is not allowed to volunteer in the 2017 celebration

　　B. can become a volunteer in the company of a parent

　　C. is permitted to become a volunteer on his own

　　D. may volunteer with his application signed by a parent

　　B

　　A plane recently made an emergency return to Tennessee's Nashville International Airport after hitting birds at take­off. A few weeks ago, there was a similar incident at Chicago's O'Hare Airport involving an Alaska Airlines flight that made an emergency landing in Oakland. According to a report by the Federal Aviation Administration, the number of bird strikes has increased nearly six times since 1990 to a record 10,343 in 2017.

　　This is blamed on three major factors. There are larger populations of birds — for example, there are twice as many Canada geese in North America now as there were in 1990. And many birds find airports to be attractive habitats. Besides, there are more flights at the airport. And quieter engines also contribute to the increasing incidents.

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