题干

切除法是研究内分泌腺生理功能常用的一种方法,下列有关叙述正确的是    (    )

A:切除某动物垂体后,生长激素增加,甲状腺激素增加

B:切除某动物垂体后,生长激素减少,甲状腺激素增加

C:切除子宫的妇女,不能排卵,第二性征正常

D:切除子宫的妇女,正常排卵,第二性征正常

上一题 下一题 0.0难度 选择题 更新时间:2019-03-08 12:12:41

答案(点此获取答案解析)

D

同类题4

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

    Many facts suggest that children are overweight (超重的) and the situation is getting worse, according to the doctors. I feel there are a number of reasons for this.

    Some people blame the fact that we are surrounded by shops selling unhealthy, fatty foods, such as fried chicken and ice cream, at low prices. This has turned out a whole generation of grown-ups who seldom cook a meal for themselves. If there were fewer of these restaurants, then probably children would buy less take-away food.

    There is another argument that blames parents for allowing their children to become overweight. I agree with this, because good eating habits begin early in life, long before children start to visit fast food shops. If children are given fried chicken and chocolate rather than healthy food, or are always allowed to choose what they eat, they will go for sweet and salty foods every time, and this will carry on throughout their lives.

    There is a third reason for this situation. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games. Not only is this an unhealthy pastime (消遣), it also gives them time to eat more unhealthy food. What they need is to go outside and play active games or sports.

    The above are the main reasons for this problem, and therefore we have to encourage young people to be more active, as well as steering them away from fast food shops and bad eating habits.