解析：选B　情态动词表推测用may。

　　18．A.remembered B．seen

　　C．received D．noticed

　　解析：选D　与前面动词forgotten并列，指"忘记"或未"注意"。

　　19．A.conscious B．awake

　　C．dangerous D．happy

　　解析：选B　与前面asleep构成对比。

　　20．A.images B．messages

　　C．dreams D．knowledge

　　解析：选A　此处是大脑中出现了message后，使用一种特殊的"形象"表现出来。如发明缝纫机针头时的spear的形象。

　　Ⅳ.阅读七选五

　　Is breakfast important? Yes, it is. Often we neglect breakfast, sometimes due to busy schedules or after the time for breakfast has passed.It's not a healthy choice to skip breakfast even if you are trying to lose weight.

　　Some people skip their breakfast as a strategy to lose weight. Not a smart choice！__1__ Just like a machine, your body needs to be refueled and it begins with breakfast.

　　Breakfast is the most important meal of the day.__2__ Not only your body, but your brain also needs nutrition to work properly. When you skip your breakfast, you tend to become tired, sleepy and cannot concentrate well because you lack some energy.

　　__3__ Many studies prove that people who eat breakfast regularly are more likely to have a good healthy weight. Also, skipping breakfast will make you eat lunch more than you usually do.

　　__4__ Additionally, eating breakfast raises your metabolism (新陈代谢) by 10%.

　　Besides adding more energy, breakfast will help to restore your sugar level when you're not eating for about twelve hours.It can also give long term effects of preventing high blood pressure, diabetes (糖尿病) and even obesity!

　　Many people do not eat sufficient important nutrients like vitamins and minerals needed daily e．g.calcium, protein, carbohydrates, vitamin B etc.__5__

　　Always encourage your children to have breakfast and make it a habit.Skipping it will make them think that it is not important.

　　Breakfast will help them increase their learning ability and memory function.Studies have shown that children who have breakfast have better grades

　　 than those who don't.So，still want to skip your breakfast?

A．There are several ways that eating breakfast might be helpful.