改写句子 按括号中的要求完成句子，每个空格填一个单词。（5分）

小题1:There is a big lake in the park.  (改为否定句)

There _____________ ______________ a big lake in the park.

小题2:He has lived in this village for 80 years. (就句子画线部分提问)

_____________ _____________ he lived for 80 years.?

小题3:The problem is very difficult. I can’t work it out.  (改写句子,句意不变)

The problem is _____________difficult for me ____________work out.

小题4:“What are you doing ?” My mother asked me. (改写句子,句意不变)

My mother asked me ____________I ____________ doing .

小题5:We shouldn’t drop litter anywhere when we visit the interesting places. (改写句子,句意不变)

Litter shouldn’t _____________ ___________ anywhere when we visit the interesting places.

关于肉毒杆菌，下列哪项是错误的（）

A.产生外毒素

B.兼性需氧

C.严格厌氧

D.革兰染色阳性

E.产生芽胞