自然保护区是生物多样性就地保护的主要场所。

阅读理解。根据短文内容，选择正确答案。

    A lot of boys and girls in west countries are wearing the same kinds of clothes: Many of them have long hair, so it is often difficult to tell whether they ate boys or girls.

    One day, an old man went for a walk in Washington. When he was tired he sat down on a long chair. A young person was standing onthe other side of the pool.

  “Good Heavens!” the old man said to the person who was sitting next to him on the chair. “Do you see that person with long hair? Is ita boy or a girl?”

  “A girl.” said his neighbor, “She's my daughter.”

  “Oh!” the old man said quickly, “I'm sorry. I didn’tknow that you were her mother.”

  “I'm not,” said his neighbor, “I'm her father.”

电焊工人在焊接时，要戴上防护眼罩，这主要是为了  (    )

如图是生殖过程简图，下列对图中①、②、③、④的判断不正确的是（　　）