第2题: [单项选择]Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food. A. unavoidable B. unexpected C. unchecked D. unfortunate 参考答案:B 答案解析:[解析] unrestrain是restrain的反义词,意思是“不受控制的”,与unexpect可替换。unavoidable不可避免的;unchecked不受检查的;unfortunate不走运的