某一个操作系统具有分时兼批处理的功能，设计一个合理的队列调度策略，使得分时作业响应快

某农户一亩地种植小麦的成本是300元，将该亩地产出的小麦送往收购站的运输费为80元，那么根据杜能区位理论分析，该亩小麦的销售成本为( )元。

A．220
B．300
C．80
D．380

用动词的适当形式填空。

1. The meeting _______ (start) at 8:30 am and _______ (finish) at 3:30 p.m.

2. We _______ (have) pizza for dinner tonight .

3. They _______ (see) many different kinds of birds at Beijing Wildlife Park yesterday.

4. If more and more wetlands _______ (disappear), there _______ (be) less and less space for plants,

    animals and birds.

5 ._______ (not drop) litter carelessly.

6. Mr. Green _______ (not go) home until he finished his work.

7. Mother told me _______ (wash) the clothes at home.

8. It's important for the students _______ (write) carefully and clearly.

9. Listen! How beautifully the girls _______ (sing)!

10.               you              (go) to visit your grandfather next week?

《证券投资基金法》对基金投资的禁止行为作了规定，下列各项不属于规定的禁止性行为的是（）。

A．基金之间相互投资 

B．基金托管人、商业银行从事基金投资 

C．基金管理人以基金的名义使用不属于基金名下的资金买卖证券 

D．从事证券交易

下列关于乳酸脱氢酶的叙述，错误的是

A．具有5种同工酶
B．它属于单体酶
C．其辅酶是NAD⁺
D．乳酸脱氢酶可用LDH表示
E．乳酸脱氢酶同工酶之间的电泳行为不同

弗里德曼认为，从长期看，通货膨胀和失业之间不存在一种替代关系。