一木块浮在水面，向水中撒入一些细盐，待盐溶化后，木块所受的浮力将______（填

阅读理解.

                                                             A Trip to the Forest

    One day Bob took two of his friends into the mountains. They put up their tents 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 started 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 happen if the horses

took the road to his house? That would be a trip of thirty-five killometres 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 because ________.

    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

下面的字你能组出几个词语。

样（　　）（　　）（　　）（　　）

跑（　　）（　　）（　　）（　　）

套期保值的基本做法是（）。

A．在现货市场交易同时，做一笔与现货交易品种、数量、期限相当但方向相反的期货交易 

B．在现货市场交易同时，做一笔与现货交易品种、数量、期限相当且方向相同的期货交易 

C．在现货市场交易同时，做一笔与现货交易品种、期限相当但数量更大的期货交易 

D．在现货市场交易同时，做一笔与现货交易品种、期限相当但数量更小的期货交易

军事航天技术的应用内容主要包括：（）

A.航天监视

B.航天支援

C.航天作战

D.航天勤务保障

急性肺水肿( )

A．逐渐加重的呼吸困难，咳嗽，痰中带血
B．呼气性呼吸困难，两肺广泛哮鸣音
C．呼气性呼吸困难，两肺散在干湿啰音
D．端坐呼吸，两肺底湿啰音
E．发热、咳嗽，夜间阵发性呼吸困难，听诊肺部无异常