题目内容：
—We'll go for a picnic if it ______tomorrow.
A isn't going to rain B won't rain C doesn't rain D isn't raining
参考答案：
答案解析：
选择题：—We'll go for a picnic if it ______tomorrow.
- 题目分类： 大学英语B级
- 题目类型：选择题
- 查看权限：VIP
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六价铬与二苯碳酰二肼反应时，显色酸度一般控制在0.05～0.3mol／L（1／2H2SO4）。显色酸度高时，显色快，但色泽不稳定。A．正确B
六价铬与二苯碳酰二肼反应时，显色酸度一般控制在0.05～0.3mol／L（1／2H2SO4）。显色酸度高时，显色快，但色泽不稳定。A．正确B．错误