A．alreadyB．stillC．yet
A. already
B. still
C. yet
What did Stephen Kajlura and Kim Holland initially want to prove by the experiment？
A. hammerheads have slender bodies than sandbar sharks.
B. hammerheads could sense subtler electric fields than sandbar sharks.
C. hammerheads could sweep more food than sandbar sharks.
D. adult hammerheads may have more advantages than young hammerheads.
What does the man recommend that the woman do？
A. Replace her car with a new one
B. Call to make an appointment
C. Repair her car by herself
D. Take her car there tomorrow
公关调查的对象是()
A. 公关人员
B. 公众
C. 媒介
D. 组织人员
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