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【单选题】
植物的光合作用,是地球上最为有效的固定太阳光能的过程,人类消耗的石油,天然气等,其实是远古时期植物光合作用的直接和间接产物。地球每年经光合作用产生的物质有1730亿至2200亿吨。其中蕴含的能量相当于全世界消耗总量的10到20倍,但目前利用率不到3%。光合作用是高效利用太阳能的最好榜样,破解光合作用的神秘机制,将为建立“人工光合作用系统”,继而开发清洁高效的新能源奠定基础。A.
植物光合作用的神秘机制
B.
提高光合作用利用率的途径
C.
太阳能与植物光合作用的关系
D.
破解光合作用机制的重要意义
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【单选题】The two books are the same ______ this one has an answer key at the back.
A.
except
B.
except that
C.
except for
D.
besides
【单选题】（ ）是所有从业人员在职业活动中应该遵循的行为守则，涵盖了从业人员与服务对象、职业与职工、职业与职业之间的关系。
A.
职业道德
B.
职业习惯
C.
职业关系
D.
职业传统
【单选题】Consider two corporate bonds identical in all respects except that one is convertible and the other is not. The return on the convertible bond should be______.
A.
higher than that on the unconvertible bond
B.
lower than that on the nonconvertible bond
C.
the same as that on the nonconvertible bond
D.
that one cannot tell which one of the two bonds should have a higher return
【简答题】磁性固位种植义齿是利用磁体的特性,将衔铁固定于______,而将永磁体固定于相对应的______,借助______增加覆盖式种植义齿的固位。
【单选题】Consider two corporate bonds identical in all respects except that one has a call provision and the other has not. The return on the callable bond should be______.
A.
higher than that on the noncallable bond
B.
lower than that on the noncallable bond
C.
the same as that on the noncallable bond
D.
that one cannot tell which one of the two bonds should have a higher return
【单选题】Apart from one or two minor mistakes, I thought the concert was excellent.
A.
except
B.
except for
C.
except from
D.
excepting
【单选题】No one, except his two best friends, ______where he is.
A.
know
B.
to know
C.
knows
D.
knowing
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