下列哪一项不是大肠埃希菌耐热肠毒素的特性( )

A．对热稳定，100℃加热20分钟仍不被破坏
B．由STa和STb两个活性部分组成
C．STb为主要毒性所在
D．激活鸟苷环化酶
E．激活腺苷环化酶

根据首字母或中文提示完成句子。

小题1:Tony likes talk show. But he can’t s        Chinese cooking.

小题2:Look! Tom and his family are l        on the beach, they look happy.

小题3:We had great fun s       in the river.

小题4:The pop singer w      funny glasses is Johnny Dean.

小题5:I’m s       she can dance so well. She is only 7 years old.

小题6:---What e       do you have to do?

---We have to clean the classroom.

小题7:On weekends, the shops are too c      , there are so many people in them .

小题8:--- What’s Lilei doing?

--- He’s w      for the bus.

小题9:Jenny is lazy, she n        does her homework at home.

小题10:Do you think everyone e________ their weekends?