隧道总体实测项目有隧道宽度、隧道净高、隧道偏位、线路中心线与隧道中心线的衔接以及边坡

28．阅读材料，回答问题。（11分）

材料一 全球12﹪、美国20﹪的玉米和巴西50﹪甘蔗用于乙醇制造，全球20﹪、欧盟65﹪的菜籽油、全球20﹪豆油、东南亚30﹪的棕榈油用于生物柴油。

我国生物燃料乙醇项目是在“十五”期间提出的。近期，国家发改委发出紧急通知：要求积极稳妥地推动生物燃料乙醇产业发展，维护国家粮食安全。

材料二 1996—2003年我国耕地数量的变化

（1）评价发展农产品提炼生物燃油产业

对环境的影响。

（2）1996—2003年，我国耕地数量总体

上呈明显的           趋势。

试分析我国耕地数量变化的原因。

（3）结合我国国情，分析我国发展粮食燃料乙醇工业存在的主要问题。

WHO规定：通过改变人们的饮食行为而达到改善营养状况目的的一种有计划活动称为（）

A.食物强化

B.营养宣传

C.合理膳食

D.合理营养

E.营养教育

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A．expend

B．employ

C．consume

D．utilize

蛋白质三级结构指的是

A．局部肽链的全部原子的空间排布位置
B．整条肽链的全部氨基酸残基的相对位置
C．亚基与亚基间的布局和相互作用
D．肽链主链骨架原子的相对空间位置
E．氨基酸的排列顺序

建筑物的耐久等级为二级时，其耐久年限为（），适用于一般性建筑。

A、15年以下

B、25-50年

C、50-100年

D、100年以上