题目

 You ________ be hungry already— You had lunch only two hours ago!    A. can’t            B. wouldn’t         C. needn’t         D. mustn’t 答案：A请先阅读下面短文,掌握其大意,然后用方框中所给词的适当形式填空,并将答案填写到答题卡的相应位置。每个词限用一次。know life different back and interesting sign real find theyThe planet Mars is the closest and most similar planet to Earth. It is very【1】to scientists. For example, Mars has seasons with【2】weather, but other planets have the same temperatures all year round. Was there【3】on Mars?To find out, scientists need【4】if Mars ever had water. In 2004. two robot explores (探测器), or 'rovers', called Spirit and Opportunity were sent to look for【5】of water. These rovers can drive over rocks【6】all kind of rough ground. They can also use cameras and send photos【7】 to Earth. First, the two rovers found chemicals and patterns (图文) in the rocks that were probably made by water. Then, they moved to another area and【8】other rocks which may have been created by water. Now scientists think there was probably water on the planet long ago. Today 【9】are still not sure if there was life on the mars. They【10】need more information to decide. The discoveries of the two rovers answered some old questions, but they also brought up many new ones.