【单选题】Topic sentence________________________________. One very real problem is that of traffic signs and signals. Those that are red green colour blind have trouble seeing stop signs found on shady streets ...
A.
Colour-blind people do not have so many problems as we expect.
B.
Colour-blind people have problems that we do not understand at all.
C.
Colour-blind people have problems that people who perceive colour never think about.
D.
Colour-blind people have problems that will be solved in the near future.
【判断题】食物的相生相克是指食物之间(包括各种营养素、非营养素)相互影响、相互制约的关系。()
【单选题】Because of the ______ noise of traffic I couldn’t get to sleep last night.
【判断题】每日推荐摄入量(recommended dietary allowance,RDA)是指营养素缺乏发生率较低的营养素摄入量。()
【判断题】非必需营养素是指人体不一定要补充、吸收的营养素。()
【简答题】人体必需的“第七类营养素”是指____________。
【单选题】营养素是指( )
A.
富含蛋白质,脂肪等化合物的食物都可以称为营养素
B.
人类为生存,健康而从外界摄取的所有食物中能提供热能的物质
C.
人类从食物中所能获得的无机盐,维生素等宏量和微量元素物质的总称
D.
机体为维持健康,保证生长发育和体力劳动必须从外界摄取的营养物质
【简答题】P assage Three After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: the damage and death toll could have been much worse. More than 60 people die...
【单选题】营养素需要量是指维持正常生理功能所需要的( )