第4题: [单项选择]—I always look out before crossing the street. —You are right. You can't be too______. A. nervous B. careful C. careless D. hurried 参考答案:B 答案解析:[参考译文] ——我在过街前总是要留神四处看一下。——你这样做是正确的,要尽可能小心。短语can't be too careful意思是as careful as possible“尽可能小心”。