15.We were losing the ability to make ________ commitment.
A. static
B. stable
C. legalise
D. credible
正确答案：D
解析
static adj. 静止的；稳定的；
stable adj. 稳定的，稳固的；
legalise v. 使合法化；
credible adj. 可信的，可靠的；
译文：我们正在丧失作出可信承诺的能力。
考察点：词义辨析
评分等级：★★★☆☆
credible commitment 固定短语
static
adj.
| 1. |
静止的；静态的；停滞的not moving, changing or developing |
| 2. |
静力的acting as a weight but not producing movement |
n.
| 1. |
天电（干扰）noise or other effects that disturb radio or television signals and are caused by particular conditions in the atmosphere |
| 2. |
静电electricity that gathers on or in an object which is not a conductor of electricity
My hair gets full of static when I brush it. 我梳头时头发就有好多静电。 |
| 3. |
静力学the science that deals with the forces that balance each other to keep objects in a state of rest |
| 4. |
(informal) 抨击；指责；愤慨angry or critical comments or behaviour |
什么是静力学？
根据wiki百科的解释
静力学是力学的分支，专门解析物体在静力平衡状态下的负载（力量，力矩）。在这状态下，或许有外力作用于此物体；但是，各个分系统的相对位置、成分、结构仍旧保持不变。当呈静力平衡状态时，系统或者是静止的，或者其质心维持常速运动。
Based on the fact that the bearing capacity of pile depends on the condition of pile body,mechanical parameters of the media around it, and loading period, the mechanism of dynamic and static bearing capacity for the single-pile is stu-died.
本文在分析单桩的承载能力取决于桩身条件、桩周岩土介质的力学参数和受载的作用时间的基础上，探讨了单桩的动力和静力的承载机制。
评分等级：★★★★☆
stable
n.马厩；马房；（养马作特定用途的）养马场
adj.稳定的；稳固的；牢固的；稳重的
v.使（马）入厩；把（马）拴在马厩
legalise
v.使合法化；使得到法律认可
credible
adj.可信的；可靠的；（因看似可能成功而）可接受的
Community service is seen as the only credible alternative to imprisonment.
除监禁外，社区劳动被看作是唯一可接受的选择。
【派生词】credibly adv.
We can credibly describe the band's latest album as their best yet.
我们完全可以说，这支乐队的最新专辑是他们迄今的最佳作品。