The author states that during dream sleep, the animal sleeps

• A、without moving
  
  

• B、shallowly
  
  

• C、intermittently
  
  

• D、on its side
  
  

自信的价值不言而喻，在我们面临一个个挑战时，正是因为拥有了自信，我们才拥有了最终的成功：请以The Value of Self-confidence为题写一篇能够体现自信价值的，150词左右的英语短文。

The author suggests that, because there are no hiding places in the oceans, whales and dolphins

• A、 sleep only when they are very young
  
  

• B、 cannot afford to sleep very much
  
  

• C、usually dream while awake
  
  

• D、take turns to sleep