【判断题】【消耗次数：1】
锌具有促进维生素A代谢的生理功能。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
锌的生理功能描述，哪个选项错误（）
①
促进食欲
②
促进VitA的正常代谢和生理功能，有利于维持视觉和皮肤健康
③
参与人体许多金属的组成
④
促进性器官与性机能正常发育
⑤
参与免疫功能过程
随机题目
【单选题】
南方某厂订立有严格的上、下班制度并一直遵照执行。一天深夜突降大雪，给交通带来极大不便，次日早晨便有许多同志上班迟到了，厂长决定对此日的迟到者免于 惩罚。对此，企业内部职工议论纷纷。在下列议论中，你认为哪种说法最有道理?
①
厂长滥用职权。
②
厂长执行管理制度应征询大部分职工的意见。
③
治厂制度又不是厂长一人订的，厂长无权随便变动。
④
规章制度应有一定的灵活性，特殊情况可以特殊处理。
【单选题】
-Id like to buy that coat. -Im sorry. ___.
①
it sold
②
its selling
③
Its been sold
④
it had been sold
【单选题】
The key ___ on the table when I leave.
①
was left
②
will be left
③
is left
④
has been left
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒)．5. Which title best fits the passage?
①
A. Trees and Man
②
B. The Function of Tree Wood
③
C. How do People do with Trees?
④
D. The Usage of Tree Roots
【单选题】
Doctors ___ in every part of the world.
①
need
②
are needing
③
are needed
④
will need