题目内容
【题目】 The planet Mars is the 【1】(close) and most similar planet to Earth. It is very interesting to scientists. For example, Mars has seasons with different weather, but other planets have 【2】 same temperatures all year round. Was there l【3】 on Mars?
T【4】 find out, scientists need to know if Mars ever had water. In 2004, two robot explorers(探测器), or ‘rovers’， called Spirit and Opportunity were sent to look for【5】(sign) of water. These rovers can drive over rocks 【6】 all kinds of rough ground. They can also use cameras and send photos back to Earth. 【7】(one), the two rovers found chemicals and patterns(图纹) in the rocks that were probably 【8】(make) by water. Then, they moved to another area and found other rocks w【9】 may have been created by water. Now scientists think there was probably water on the planet long ago. Today they are still not sure if there was life on Mars. They 【10】(real) need more information to decide. The discoveries of the two rovers answered some old questions, but they also brought up many new ones.
【答案】
【1】closest
【2】the
【3】life
【4】To
【5】signs
【6】and
【7】First
【8】made
【9】which
【10】really
【解析】
本文是一篇说明文。主要介绍了对于火星上是否有生命的探索。科学家们的探索解决了一些老问题，也带来了许多新问题。
19.句意：火星是接近地球最近并且是最相似的星球。根据空前的the和空后的most similar可知此处应填最高级。故填closest。
20.句意：例如，火星有不同天气的季节，但是其他星球整年有相同的温度。same前面需加定冠词。故填the。
21.句意：在火星上有________吗？结合语境及首字母提示可知此处指火星上有生命吗？且根据Was提示可知，此处应填名词单数，故填life。
22.句意：________找到答案，科学家们需要知道火星上是否曾经有水。由语境可知，此处表示“为了”，结合首字母提示可知填To。
23.句意：在2004，两个被称为“精神”和“机会”的机器人探索器，或“漫游者”，被送往(火星为了去)寻找水的________。结合语境可知迹象不止一种，应填名词复数。故填signs。
24.句意：这些漫游者可以穿越岩石________各种崎岖不平的地面。分析句子结构可知此处缺少并列连词来连接rocks和all kinds of rough ground，故填and。
25.句意：________，两个探索器发现了岩石里的化学物质和图纹……。根据语境可知，此处指首先。故填First。注意句首单词首字母需大写。
26.句意：首先，两个探测器发现石头上可能由水造成的化学物质还有图纹。分析句子结构可知此处为被动语态，应填过去分词。故填made。
27.句意：然后，他们移到另一个地区，发现其他可能由水造成的岩石。分析句子结构可知该句为定语从句，先行词为rocks，指代物，在定语从句中作主语，根据首字母提示可知填which。
28.句意：他们________需要更多的信息来决定。分析句子结构可知此处缺少副词修饰动词need，故填really。
