相关知识点: 试题来源: 解析 B。“necessary”意思是“必要的”,B 选项“important”是“重要的”,意思相近;A 选项“unnecessary”是“不必要的”;C 选项“useless”是“无用的”;D 选项“optional”是“可选择的”。本题考查单词的意思。反馈 收藏
Not Getting Enough Sleep Can Have Major Impact on Your Body
Teenagers are damaging their health by not getting enough sleep because they are distracted (分散) by electronic products in their bedrooms, according to a survey. UK advice body The Sleep Council said "junk sleep" could rival (比得上) the consumption of unhealthy junk food as a major lifest...
Protein is also a critical part of the processes that fuel your energy and carry oxygen throughout your body in your blood. It also helps make antibodies that fight off infections and illnesses and helps keep cells healthy and create new ones. Plus, protein helps you feel full, so it's o...
Not getting enough sleep can affect you in a lot of ways. Lack of sleep can cause changes in your metabolism rate, concentration, mood, memory, stress hormones, motor skills and even in your immune system. So getting the right amount of sleep is really important. ...
Red blood cells carry life-sustaining oxygen throughout your body (The Great Gas Exchange). White blood cells produce antibodies that battle infection (The Second Front: Inflammation). Platelets create clots that prevent your blood from leaking out of damaged skin. Without any one of these ...
Anemia robs your body of red blood cells making it difficult for your tissues to get enough oxygen. That can lead to fatigue and muscle cramping. Lupus, arthritis, chronic fatigue syndrome, and fibromyalgia are among other things that contribute to body aches. ...
Getting enough vitamins is essential to life, although the body has no nutritional use for excess vitamins. 相关内容 a希望不要像前越南 The hope do not have to look like former Vietnam[translate] asick of you on my side 在我的边上厌倦你[translate] ...
If you exercise out of doors,yourbodywill learn to breathe more deeply,allowing even more oxygen to get to your muscles and your brain. 2019年高考英语全国卷I 阅读理解 七选五 原文 In fact, the key to easy morning wake-up lies in resting yourbodyclock. ...
You are not a child any more, but you are not an adult, even though you have to deal with some very grown-up problems and decisions.,可知答案。 2.根据Families can be one of the biggest causes of stress, such as arguing problems with parents at home, or with brothers and sisters.,...