地球的质量是火星质量的p倍，地球的半径是火星半径的q倍，在火星_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

地球的质量是火星质量的 p 倍，地球的半径是火星半径的 q 倍，在火星表面发射一颗绕火星做圆周运动的卫星，其发射速度至少是地球第一宇宙速度的几倍（　　）

A．pq

B．

C．q/p

D．

答案

答案：D

问答题简答题

简述下肢慢性溃疡的常见病因。

完形填空

Nadya Vessey, of Auckland, New Zealand, was born with an illness. So at the age of 16,       of her legs below the knees were cut off. One day when a little boy was watching _    take off her prosthetic(假体的)legs, he asked her       she didn't have any legs. Thinking quickly she asked him whether he had read The Little Mermaid（美人鱼）．He said“_   ．”So Nadya told him that she was a mermaid. The Little boy was         and said,"Wow! That's so cool!” And then he ran off to tell his Dad.
The       of becoming a mermaid became clearer and clearer in Nadya's mind. After       it over, she wrote to Weta Workshop in Wellington to ask if they could     her. She never believed they actually would, so she was excited when she knew they_  _. Weta workshop's manager, Richard Taylor, was very pleased to make it true, and wanted Nadya to be _   .
It took Weta Workshop two years to make a special     for Nadya. "A prosthetic is a prosthetic, and your body has to be comfortable       it and you have to make it part of        ". After practicing in the       , Nadya went to the open sea to try on her mermaid suit. It was         amazing and great to watch Nadya swim, and to see her dream come true.
Nadya Vessey herself has written the story of a real mermaid.

A．dining hall

B．waiting room

C．living room

D．swimming pool