为什么我们细细咀嚼馒头时会感觉有点甜？

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项

Weight loss is a hard topic. Lots of people aren’t satisfied with their present weight, but most people aren’t sure how to change it. You may want to look like the models or actors in magazines or on TV, but those goals might not be healthy or realistic(现实的) for you .  小题1:  

So what should you do about your weight control?

  小题2:   The best way to find out if you are at a healthy weight or if you need to lose or gain weight is to talk to a  doctor  or  dietitian （营养学家 ).

  小题3:   If it turns out that you can benefit from weight loss then you can follow a few of the simple suggestions listed below to get started.

  小题4:   People who lose weight quickly by crash dieting or other extreme measures usually gain back all of the pounds they lost, because they haven’t permanently(永久地) changed their habits. Therefore, the best weight management ways are those that you can maintain for a lifetime.

Small changes are a lot easier to stick with (坚持做) than large ones. Try reducing the size of what you eat.    小题5:   Once you have that down, start gradually introducing healthier foods and exercise into your life.

It’s a good idea to maintain a healthy weight because it’s just that: healthy.

A．Try giving up regular soda for a week.

B．Try to pay attention as you eat and stop when you’re full.

C．Weight management is about long-term success.

D．Besides, no magical diet will make you look like someone else.E．Being healthy is really about being at a weight that is right for you.

F．Changing from whole to nonfat or low-fat milk is also a good idea.

G．They will compare your weight with healthy standards and help you set goals

下列何药可"久服轻身益气而耐老"（）

A.茯苓

B.茵陈

C.泽泻

D.藿香

E.金银花

某冶金工厂操作平台横剖面如图所示。平台承受由检修材料所产生的均布活荷载标准值为20kN/m²，平台结构自重为2kN/m²，每跨横梁中部设有检修单轨吊车，其作用荷载标准值F=100kN，每片框架承受水平活荷载标准值H=50kN，平台柱自重可忽略不计。

平台梁跨度9m，柱距5m，柱高6m，柱顶与横梁铰接，柱底与基础固接，各列柱纵向均设有柱间支撑，柱顶纵向有可靠支承，平台面铺钢板，与横梁焊接。

平台结构采用Q235-B·F(3号钢)制作，在框架平面内，中柱截面惯性矩为边柱的2倍，中柱截面为钢板焊成的实腹工形柱，如题图，两翼缘为-250mm×25mm，腹板为-450mm×12mm。i_x=21.1 cm，i_y=6.03cm，W_x=3187cm³。

柱CD，λ_y=100，=0.463，在N=1126kN、M_x=210kN·m作用下，截面在框架平面外稳定性的最大应力是（）。

A．123.3N/mm²

B．137.8N/mm²

C．158.4N/mm²

D．186.7N/mm²

下列哪个国家强制要求在建筑领域使用BIM技术（）。

A、美国

B、英国

C、日本

D、韩国

比较三种RNA的区别。