单项选择题

下列选项中，不属于影响工资水平确定的因素是（）。

A.个人偏好
B.劳动者个人及其家庭所需的生活费用
C.同工同酬的原则
D.企业的工资支付能力

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Seeing Red Means Danger AheadThe color red often means danger-and by paying attention，accidents can be preventeD.In the future，the color red also may help【51】______danger at construction sites．Thanks to new work by engineers，bridge supports-or【52】______kinds of materials-could one day contain a color-changing material．It will turn red【53】______a structure collapses or falls apart．The secret【54】______the color-changing material is a particular type of molecule(分子)．A molecule is a group of atoms(原子)held together by chemical bonds．Molecules come【55】______all shapes and sizes，and make up【56】______you can see，touch or feel．How a molecule behaves depends on【57】______kinds of atoms it contains，and how they're held together．When a polymer(聚合物)containing a color-changing molecule called a mechanophore(机械响应性聚合物)is about to break，it produces a【58】______．When a polymer with mechanophore molecules becomes“injured”or【59】______，one of the mechanophore bonds【60】______and the material turns reD.“It's a really simple detection method，”says Nancy Sottos，one of the scientists who worked on the project．Sottos and her team tested the color-changing polymers in their laB.The test【61】______ proved encouraging．There is a way to get rid of the red color：light．When a bright light is shone on the mechanophore， the broken bond is fixed-and the red color【62】______．This“self-healing”may be a problem for engineers．They need to use the color-changer in big construction projects that will be【63】______，in sunlight．And sunlight will make the mechanophore's warning system【64】______．Sottos and her fellow scientists still have【65】______work to do before the color-changing molecules can be used outside the laB.(51)A.throwB.preventC.createD.keep

A.In
B.Thanks
C.It
D.A
E.Molecules
F.How
G.When
H.“It's
I.Sottos
J.The
K.When
L.This“self-healing”may
M.They
N.And
O.
(51)
A.throw
B.prevent
C.create

单项选择题

某种职业所需要的劳动力出现短缺，但受外力限制，其他劳动者又无法转入这个职业就业，从而使从事这一职业的原有劳动者保持了垄断地位，获得垄断性工资收入，这种情况产生的工资差别是（）。

A.补偿性工资差别
B.竞争性工资差别
C.非自然性垄断造成的收入差别
D.自然性垄断造成的收入差别

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