按要求改写下列句子。

1. He needs some help.( 改为一般疑问句)

   _____ he_____ _____ help?

2. I need a number 30 bus.( 就画线部分提问)

   _____ _____ _____ you need?

3. His friend's father is a teacher.(  就画线部分提问)

    _____ _____ his friend's father _____ ?

4. Take the fifth turning on the left.( 改为否定句)

    _____ _____ the fifth turning on the left.

5. Li Ming's predication is to be an English teacher.( 就画线部分提问)

    _____ _____ Li Ming's predication?

单斜晶系的晶体常数的是（）

A.a≠b≠c，α=β=ｒ=90°

B.a≠b≠c，α=ｒ=90°，β≠90°

C.a≠b≠c，α=β=90°，ｒ＝90°