火眼金睛，选词填空。

1. This is _____________ (a, an) ice-cream.

2. These _____________ (photos, photoes) are very nice.

3. I like reading _____________ (book, books).

4. There are five _____________ (knifes, knives).

5. She can _____________ (makes, make) kites.

试述肾癌的临床表现和诊断要点。