题目

从方框中选出合适的句子完成对话A. Are there any tigers?B. Are there any mountains there?C. What's in the park?D. No, there isn't.A: Let's go to the park tomorrow, Li Ping.B: That sounds good. A: There are many trees and flowers.B: A: No, there aren't. But there are monkeys and birds.B: A: Yes, they are behind a farm. We can take photos there.B: That's wonderful. Is there a restaurant in the park?A: We can take some food.B: Great. Let's go on a picnic(野餐).据新华社报道，我国科学家首次合成了镅的一种新同位素，它和铀比较，下列叙述中正确的是A．它们互为同位素      　　　　　　     B．原子核内的中子数相同C．比多3个中子      　　    D．具有相同的质量数