句型转换。

1.We should allow teenagers to swim in the river.（改为被动语态）

      Teenagers                     to swim in the river

2. She said something important to me yesterday.（改为否定句）

      She                   important to me yesterday.

3.1 was so anxious that I couldn't sleep.（改为同义句）

      1 was ____ anxious ____  sleep.

4．They are very friendly.（改为同义句）

       They are ____ to ____               .

5. I spent two hours doing my homework last night.（对画线部分提问）

    ____          did you spend doing your homework last night?

会引起儿茶酚胺降低的有（）。

A.心肌坏死

B.Addison病

C.嗜铬细胞瘤

D.交感神经母细胞瘤

E.肾上腺髓质增生