Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactions and devices. There is, however, one general pattern of behavior. In the presence of suspected enemy the first reaction is to try to escape observation; if this fails, the next resort is the flight to some inaccessible retreat, but if this is not possible, or is circumvented, various kinds of intimidatory gestures and warning devices are brought into play; in the last resort the snake attacks. This pattern varies with the circumstances; some stages may be omitted or combined unpredictably whilst; some notoriously irascible species may dispense with all the preliminaries and attack almost at once, though seldom or never without some provocation.
Amongst the factors that increase aggressiveness are hunger, the mating season and surprise, with the last mentioned the commonest; when hunting for food or for mate, activity and the ag
A. it meets a possible enemy.
B. it is caught when it is sleeping or sloughing.
C. it is disturbed unknowingly.
D. it seeks a partner in the mating season.
[听力原文]
M: I’m sorry, but I’ll have to leave now. I have to be at the airport at 6:30.
W: Well, it was nice meeting you. Perhaps we’ll see each other at next year’s conference.
at hard change up before win happen down choose practise come part .Life is not easy, so I’d like to say "When anything (1) , believe in yourself!" When I was a young boy, I was too shy to speak to anyone. My classmates often laughed (2) me. I was sad out could do nothing. Later, something happened, and it (3) my life. It was an English speech contest. My mother asked me to take (4) in it. What a terrible idea! It meant I had to speak (5) all the teachers and students of my school! "Come on, boy. Believe in yourself! You are sure to (6) ." Then mother and I talked about many different topics. At last I (7) the topic "Believe in yourself". I tried my best to remember all the speech and (8) it over 100 times. With my mother’s great love, I did well in the contest. I could (9) believe my ears when the news came that I had won the first place. I heard the cheers from the teachers and students. Those classmates who once looked (10) on me, all
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