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与甲状腺细胞聚碘活动密切相关的离子是

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脑膜炎球菌的生物学特性不包括

因科学研究的需要，必须进入国家级自然保护区核心区从事科学研究观测、调查活动的，必须经（）批准。

Some economists (1)___ between the international firm and the multinational company in the following way: the "international firm" is a term that (2)_ enterprises with various degrees of world orientation in their business; (3)_, the "multinational company" is one type of international firm. The international firm engages in any activity or (4)_ of activities from exporting, importing and licensing to full scale manufacturing in a number of countries. The international (5)_ of such a company varies from the point at which overseas sales and profits take on importance and top management begins to (6)_ some attention to them to the stage (7)_ the company is globally oriented in its marketing, production, (8)_, and other decisions and considers alternative opportunities around the world.
When a company reaches the latter stage, it becomes (9)_. Thus, the multinational company is one type of international company. It is a (10)_ developed international company with a deep worldwide involvement and a global (11)_ in its management and decision making. More (12)_, the multinational company in manufacturing does business in a number of countries; it has a substantial commitment of its resources in international business; it (13)_ international production in a number of countries; and it has a (14)_ perspective in its management. Significant (15)_ exist among multinational companies. First, such a company may not (16)_ do business in every region and country in the world, (17)_ it considers opportunities throughout the world. Second, it has a (18)_ portion of its assets invested in international business; (19)_ it makes a substantial part of its sales and earns a considerable part of its (20)___ overseas.

A. recognize
B. distinguish
C. discover
D. detect

听力原文：W: That clock doesn't work. I'm going to send it to the watchmaker's next week.
M: Don't do that. I can fix it myself.
W: You？ You can fix it？
M: Why not？ I have done it before.
W: That's why it doesn't work now.
What has happened to the clock？

A. It has been fixed.
B. It has stopped working.
C. It has been sent to the watchmaker's.