关于可变气门正时错误的说法是（）。

A.气门升程上可变的

B.气门打开的周期是固定的

C.在低转速可或得最大转矩

D.每套进气门和排气门有三个凸轮

She had clearly no（）of doing any work, although she was very well paid.

A.tendency

B.foundation

C.intention

D.belonging