TOEFL Reading: ETS-TOEFL阅读机经 - Q73835196FX2SXZDL$

According to paragraph 5, all the following claims about the geomagnetic compass of sea turtle hatchings are true EXCEPT A. In some species it is switched on almost as soon as a turtle hatches. B. It helps keep the hatchlings heading in a direction that it is initially determined by some cue such as light or sound. C. Its direction is followed automatically to swim toward open water D. It can be used to navigate around islands when the waves stop indicating the direction of the open sea.