CLASS A->Space->A Good Place to Live in?->Level 1
	One important point to consider before you buy property on Mars is whether people can live on Mars. A NASA expert will make a presentation to your class about life on Mars. You want to ask him questions on this topic. For help, read the document "Life on Mars". Instructions: To prepare your questions, select the correct word to form  each question you plan to ask. The choose select icon shows the two choices.