题目内容

有些组织成分用甲苯胺蓝等碱性染料染色后呈紫红色，称此为异染性。（）

A. 对
B. 错

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透射电镜照片上呈黑或深灰色，习惯称该结构为低电子密度；反之呈浅灰色，称高电子密度。（）

A. 对
B. 错

扫描电镜得到的图像具有立体感。（）

A. 对
B. 错

Directions:This partis to testyour listening ability. It consists of 3 sections.Section ADirections: This section is to test your ability to give proper response. There are 5 recordedquestions in it. After each question, there is a pause. The questions willbe readtwice. When you hear a question, you should decide on the correctanswer from the4 choices marked A, B, C and D.Which one is the correct answer?

A. Pleased to meet you.
B. As usual.
C. I’m a lawyer.
D. You’re welcome.

Which one is the correct answer?

A. How do you do! I’ve long heard about you.
B. I come here to meet Mr. Smith.
C. Are you a singer?
D. I come here to meet Mr. Smith.