题干
34．--- My sister is a typist at a foreign firm.
--- I know this sort of work skill and speed.
A：asks for
B：calls for
C：looks for
D：waits for
答案(点此获取答案解析）
B
A：asks for
B：calls for
C：looks for
D：waits for
是一元二次方程，则m=（ ）