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问题 多项选择题

以下适用于利用大豆期货进行卖出套期保值的情形有（）。

A.农场在3个月后将收获大量大豆

B.榨油厂有大量大豆库存

C.榨油厂在3个月后购进大量大豆

D.贸易商已签订购货合同，确定了大豆交易价格

答案

参考答案：A, B, D

句型转换

句型转换，每空一词。

1. They're used for seeing in the dark. (改为否定句) 

    They                           for seeing in the dark.

2. Liu Weidong wanted to make Xiaoyu happy. (改为一般疑问句)

                 Liu Weidong              to make Xiaoyu happy?

3. The potatoes are too salty. (改为感叹句) 　

                               the potatoes are!

4. Chinese people invented the abacus in the sixth century. (改为被动语态)

    The abacus                           in the sixth century              Chinese people.

5. Jim can clean up parks on Sundays. (就划线部分提问) 

                              Jim clean up parks?

6. We had a great time in Hong Kong last summer. (改为同义句) 

    We                           in Hong Kong last summer.

7. The children have never seen an Indian film,                           (完成反意疑问句)

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单项选择题

先将总体中各单位按一定的标志排队，然后每隔一定的距离抽取一个单位构成样本，此种方法为（）。

A.简单随机抽样

B.系统随机抽样

C.分层随机抽样

D.整群随机抽样
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