单项选择题

When DK says "I wish I knew the answer to that," what he wants to mean is ______.

A．he certainly knows the answer
B．he cannot give a confident answer for the time being
C．he wants to find the answer later
D．he expects others to give a definite answer
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单项选择题
WACS can reduce the whale collisions by ______.
A．warning whales to get away from passing ships
B．attacking ambient noise imaging tags onto the whales
C．directing passing ships to turn away from the whales
D．teaching the whales to send signals to the passing ships
单项选择题
The ambient noise imaging is able to locate the whales even when they are silent because ______.
A．the whales may create detectable "sound shadows"
B．the new sonar equipment is more powerful
C．the new sonar technology can see through sea water
D．the existence of whales may reinforce reflection signals
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