第Ⅰ类的对人致癌物是
A．铬酸盐B．酚C．氰化物D．多氯联苯E．亚硝酸盐
参考答案：A
Although I tried my best, I could not her to stay here.
A．advise
B．advice
C．persuade
D．persuaded
有多个操作构成的宏，执行时是按_________执行的。
