1. Without gravity（重力), we ________ walk on the ground as freely as we do now.
A. couldn't B. mustn't C. shan't D. needn't
【答案】A
【解析】
【详解】考查虚拟语气。句意：没有重力，我们不可能像现在这样自由地在地上行走。A. couldn't不可能；B. mustn't禁止；C. shan't不应该；D. needn't 没必要。由语意可知，本句为与现在事实相反的虚拟语气，故句子谓语动词的否定式要用wouldn't / couldn't/ shouldn't/ mightn't+动词原形。故选A项。
2. The girl tends ________ when others ask her private questions .
A. getting angry B. to get angry C. getting angrily D. to get angrily
【答案】B
【解析】
【详解】考查非谓语动词和系动词。句意：当别人问这个女孩私人问题时，她往往会生气。根据tend to do“往往会；常常就”，可知tend后用动词不定式做宾语；get angry“生气”，此处get是系动词，后用形容词作表语，故选B。
