①平行向量一定相等；②不相等的向量一定不平行；③相等向量一定共线；④共线向量一定

函数f（x）=-2x²+6x（-2≤x≤2）的值域是 [ ]

A.[-20，4]

B.[4，4.5]

C.(-∞，4.5]

D.[-20，4.5]

胃、十二指肠溃疡病穿孔引起的急腹症早期症状中，下列哪项是错误的（）

A.腹肌紧张

B.呕吐

C.早期出现休克症状

D.发热

E.肠鸣音消失

A dog can’t speak words, but it can “talk”. It has feelings just as you do. At times it may feel angry or afraid. Watch a dog closely. You can see what it is trying to tell you. When you are afraid, you may look down shyly. A fearful dog looks away from you. It may run away too. When you are angry with people, you stare at them and press your lips together. An angry dog also stares. Sometimes the hair along its back stands up.

Do you feel guilty when you have done something you shouldn’t? Dogs can feel guilty, too. At times when I come home, my dog gives me a guilty look. Then I know he’s done something wrong.

Dogs need love and attention. Some dogs are very unhappy when they are left alone for a long time. Some dogs even snap(撕咬) if they don’t get enough attention.

You may have a dog or you may know a dog. Treat it well if you want to have fun with it. Play with it. Take it on walks. Don’t order it round too much. Try not to punish it one time and not the next for doing the same thing. Always remember, a dog has needs and feelings just as you do. Talk to a dog, it’ll talk to you, too.

小题1:If a dog snaps at things, it is because it may ______.

A．feel lonely

B．feel shy

C．be fearful

D．be disappointed小题2:You can tell that a dog has done something bad when _________.

A．its hair stands up

B．it runs away from you

C．it has a guilty expression

D．its lips are pressed together小题3:Which of the following things does the writer advise you to do towards your dog?

A．Never punish the dog

B．Never leave the dog alone

C．Train the dog to take orders from you

D．Train it the way you want to be treated.小题4: Suppose you punish your dog for tearing up a shoe, what should you do the next time it does so?

A．Talk to him

B．Punish it again

C．Pay no attention to it

D．Take it out for a walk小题5:The word “guilty” in the second paragraph most probably means _______.

A．happy

B．excited

C．frightened

D．sorry

换用辛烷值低的汽油，可适当调大点火提前角

当企业处于成熟时期，计划具有怎样的特点（）

A、指导性计划

B、短期、具体计划

C、长期、具体计划

D、短期、指导计划