用所给词的适当形式填空。

1. The children were _____ (excite) about opening their presents.

2. It is a _____ (complete) story.

3. He will _____ (challenge) me to play another ten- nis game tomorrow.

4. Could you please speak more _____ (slow)? I can't follow you.

5. He is _____ (regard) as the best writer nowadays.

涡轮风扇发动机的“三高”是指（）。

A、高使用率、高压缩比、高耗油率。

B、高推重比、高增压比、高涡轮后温度。

C、高增压比、高涵道比、高涡轮前温度。

D、高推重比、高涵道比、高发动机推力。