Scientists have also studied the birds that sometimes fly in a ball-like formation. Researchers believe that the birds come together if a predator（天敌） is spotted. The predator may then become impatient waiting for a single bird to fly away from the group. The birds will often dip and dive as a group, frustrating even the most persistent enemy. Scientists report that this is a very effective method of defense against an attack.

　　The birds care for their fellow fliers through teamwork. As transportation expert Henry Ford once said, “If everyone is moving forward together, then success takes care of itself.” When it comes to teamwork, these feathered fliers are a soaring success!

　　1. According to the passage, we can learn that birds ___________.

　　A. move faster than cyclists

　　B. prefer to fly in a V formation

　　C. are smarter than other animals

　　D. play different roles in a formation

　　2. When food is sighted, ____________.

　　A. the group follows the discoverer

　　B. the lead bird decides what to do

　　C. the discoverer leaves the group

　　D. the whole group forms a stream

　　3. To protect themselves from attack, birds will _____________ .

　　A. break into groups

　　B. come close together

　　C. change directions

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