读下面的对话并回答问题。

Joseph: Hello, my name's Joseph. Where are you from?

Andrew: Hi, I'm Andrew. I'm from the U.S. What about you?

Joseph: I'm from the U.K. This is my friend, Gao Ma.

Andrew: Nice to meet you. Where are you from?

Gao Ma: I'm from China. This is my friend, Mary.

Mary: Hello. I'm from Australia.

Andrew: Hello, Mary. Nice to meet you.

1. Where is Andrew from?

    ____________________.

2. Is Joseph from the U.S?

    _____________________.

3. Where's Gao Ma from?

    _____________________.

4. Is Mary from China?

    _____________________.

最常用的肾小球滤过型肾动态显像的显像剂（）

A．^99mTc-DTPA

B．邻-¹³¹I马尿酸钠

C．¹³¹I-6-碘代胆固醇

D．^99mTc-DMSA

E．以上都不正确