科学、合理地减轻体重的方法有（ ）
A．多运动
B．节食、只喝水
C．少吃高能量的食物
D．多吃高能量的食物
营养过剩是指碳水化合物和脂肪摄入量长期大于消耗量，能包含由于暴饮暴食或过度的摄入特定的营养素而造成的营养过剩，通过内分泌转化为甘油三脂储存在内脏表面和皮下组织，导致发胖．由于现代入膳食结构的失衡，热能摄入量增加，营养过剩，再加上现代入体力活动减少，使人体过于肥胖．减肥时要注意方法科学，不能影响营养物质的正常摄入量，不能无原则的节食．我们应该多参加适当的体育活动，这样既能消耗掉较多的脂肪，起到减肥的效果，又不影响身体健康．同时注意正常合理的饮食，少吃高能量的食物，避免脂肪堆积，可见AC符合题意．
故选：AC
| Questions 81-90 are based on the following passage. It sounds like a science fiction, but researchers say it’s a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. They might be making people sick, too. The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte- literally, "fish killer. " It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding. Seemingly prompted by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them. Whether humans are affected by the dinoflagellate’s toxin remains to be seen. Researchers think it’s unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation. To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack. |
The word "they" underlined in Paragraph 1 refers to ______.
A．organisms
B．fish
C．toxins
D．flesh