生物传感器中决定传感器的功能与质量的关键元件是A．生物敏感膜B．热敏元件C．光敏管D．荧光计E．阻抗

Hello, ()Franco Rossi speaking. Can I speak to Polly Williams？

A. this is

B. he is

C. I am

Wilson: Hello, this is Wilson. Can I speak to Peter, please？ Johnson: ______

A．Yes, speaking.

B．Who is Wilson？

C．Wrong number.

D．Thank you for calling.

Wilson: Hello, this is Wilson. Can I speak to Peter, please？ Johnson: ______.

A．Yes, speaking.

B．Who is Wilson？

C．Wrong number.

D．Thank you for calling.

Wilson: Hello, this is Wilson. Can I speak to Peter, please？ Johnson: ______.

A．Yes, speaking.

B．Who is Wilson？

C．Wrong number.

D．Thank you for calling.

Hello, Can I speak to Liu Hui, please？ ()

A. Yes, I am.

B. Yes, speaking.

C. Yes, you can.

— Hello, this is John speaking. Could I speak to Mike？

—

A、Sorry, who is Mike？

B、Hold the line, please.

C、Of course you can.

-- Hello! Is that Mr Wang speaking？

-- _________

A.Yes. This is Mr Wang speaking.

B.Yes. Can I speak to Mr Wang？

C.Sorry, you'd better ask Mr Wang.

D.No, I can't speak.

Wilson: Hello, this is Wilson. Can I speak to Peter, please？

Johnson: ______

A．Yes, speaking.

B．Who is Wilson？

C．Wrong number.

D．Thank you for callin

A、I’m Alice speaking.

B、Sorry, I’m not Alice.

C、This is Alice speaking.

D、Hello, I’m Alice.