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
  
  

下面的短文有10处空白，每处空白后的括号内有一个词，请根据短文内容将其正确的形填入文中，以恢复文章原貌。

How to Deal With Pressure?

With the current mood of global    41    (certain) and an ___42____ (economy) recession, people re likely to suffer from increased stress, depression and anxiety. These___43____(psychology) symptoms（症状）, in a new twist to the old saying of“mind over matter”, can lead to actual physical problems.

The mind and the body are ___44____ (integrate) system. It's like a web. If one part is    45    (disturb) , it will directly or indirectly, affect another part. Hence, psychological and emotional reactions will trigger physical responses.

When a person feels a threat to his well-being, the brain reacts by    46    (release) chemicals. or example, the adrenal gland (肾上腺) in the brain may release adrenaline (肾上腺素) which prepares the body to respond to physical threats. The brain's neuro-chemistry（神经化学） programs a person to react in one of the classic ways:fight, flight or fright.

Are you sleeping well?Are you eating well?Are you working or studying well?Any mental health problem would affect these three areas of behavior. Some people deal with stress and    47   (anxious) by turning to    48    (religious) , others by talking to friends and family. But are there other options?Exercise is a good outlet. Play a game. Go jogging. You will be ___49___ (concentrate) on doing something. There is a target to be___50____ (achieve) and will occupy your mind. Go Karaoke singing and dancing with friends. The worst thing to do is to sit at home and think. 

Task 2

21. In most cases of cloud-to-ground lightning, the ground's surface__________

22. One form of lightning that is ball lightning. __________

23. Cloud lightning looks like a ribbon when its lighting channel__________

24. Although not fully understanding processes of lightning, man__________

25. Lightening can__________

A. occurs most infrequently

B. is shifted sideways by strong winds

C. strike twice or more in the same spot

D. is equipped with a good knowledge of various forms of lightning

E. is estimated at 20 million a year

F. is positively charged