经济阈（yu）值

阅读理解。

                                                              A Trip to the Forest

     One day Bob took two of his friends in-to the mountains. They put up their tents (帐篷) and then rode

off to a forest to see how the trees were growing.

     In the afternoon when they were about ten kilometres from their camp (营地), it start-ed to snow. More

and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob

knew there were two roads. One road went to the camp, and the other went to his house. But all was white

snow. Everything was the same. How could he take his friends back to the camp?

     Bob had an idea. The horses! Let the horses take them back! But what would hap-pen if the horses took

the road to his house? That would be a trip of thirty-five kilometres in such cold weather!

    It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them

could tell. John looked around. What was that under the tree? It was one of their tents!

1. John and his two friends went to the forest to ____. [ ]

A. build their camp

B. find their way home

C. enjoy the mountains in the snow

D. watch the trees in the forest

2. They could not find their way back be-cause ____. [ ]

A. there was only one road to their camp

B. they couldn't decide which of the two roads led to their tents

C. there were no roads in the mountains at all

D. everything was covered by the white snow

3. It is clear that they wanted the horses to take them to ____. [ ]

A. John's house

B. the camp

C. the forest

D. the mountains

4. The horses stopped because____. [     ]

A. it was getting late

B. they were tired after running for a long way

C. they knew that they had got to the camp

D. they had seen John's house

5. The story happened ____. [ ]

A. on a cold winter day

B. on a dark snowy evening

C. in a cold camp far from villages

D. at night when nothing could be seen

在实数范围内因式分2x²-2x-1=______．

心绞痛发作时，首选的速效药物是( )

A．普萘洛尔(心得安)

B．硝苯地平(心痛定)

C．硝酸异山梨醇酯(消心痛)

D．硝酸甘油

E．阿司匹林

专项补助主要包括（）

A.无限额配套补助

B.一般均衡补助

C.非配套补助

D.有限额配套补助

E.财政补贴

布鲁菌病表现的热型是（）

A.稽留热

B.弛张热

C.间歇热

D.波状热

E.不规则热