飞机，自从它诞生之日起，便受到世人的高度重视。这种全新的交通工具，在当时采用的先进科技成果有 ①蒸汽机的改进②内燃机的发明③炼钢技术的突破 ④大型农机的发明

题干

飞机，自从它诞生之日起，便受到世人的高度重视。这种全新的交通工具，在当时采用的先进科技成果有 ①蒸汽机的改进 ②内燃机的发明 ③炼钢技术的突破 ④大型农机的发明

A：②③④

B：①②③

C：①②④

D：②③

上一题下一题 0.0难度选择题更新时间:2019-11-28 08:47:10

D

A: Hello! May I speak to David, please?

B: Hello! This is David speaking. Who's t____?

A: Simon speaking. What are you going to do tomorrow?

B: I have no i____. Do you have any plans?

A: Yes. Shall we go to the zoo?

B: Good idea. We can see different kinds of animals there. A____ them, I like pandas best.

A: So do I. I can't wait to see them. B____ the way, can we feed the pandas?

B: No, I'm afraid not. It may h____them.

A: I see. Can you take your c____ with you? Mine is broken.

B: No problem. How can we get there?

A: The No.8 bus can take us there.

B: When shall we meet?

A: Let's m____ it half past eight in the morning.

B: All right. See you then at the school gate.

A: See you.