单选题 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

【正确答案】 A

【答案解析】第五段虽然说Any approaching whale．．．creates a detectable“sound shadow'’，但并不是说鲸鱼就制造了声音阴影，而是说它们会对原有声波造成干扰，反映在图谱上就是stand out like hot spots on a thermal image，选项D符合。