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【单选题】
下列关于转基因技术的叙述，正确的是（ ）。A.
转基因生物对人类都是不利的。
B.
转基因生物对人类都是有利的。
C.
转移的基因必须表现出其所控制的性状，才算是成功的。
D.
只要将一种物种的基因转移到另一物种体内，就是获得成功。
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举一反三
【单选题】The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
A.
plant
B.
planting
C.
to plant
D.
to planting
【单选题】使用盐桥,将反应 Fe 2+ +Ag + = Fe 3+ +Ag 设计成的自发电池是:
A.
Ag(s)|AgCl(s)|Cl - ||Fe 3+ ,Fe 2+ |Pt
B.
Ag(s)|Ag + ||Fe 3+ ,Fe 2+ |Pt
C.
Pt|Fe 3+ ,Fe 2+ ||Ag + |Ag(s)
D.
Pt|Fe 3+ ,Fe 2+ ||Cl - |AgCl(s)|Ag(s)
【单选题】_______ refers to the time and effort spent learning the rules of a new market.
A.
First mover advantages
B.
Strategic commitments
C.
Pioneering costs
D.
Market entry costs
【简答题】打下课铃后,学生起立,齐声向老师说()。若有听课老师,应()方可自由活动。
【单选题】The time and effort he has devoted during the past few years trees in that remote area is now considered to be of great value .
A.
to planting
B.
to plant
C.
plant
D.
planting
【判断题】Outsourcing is a logical choice when a firm does not have certain expertise and is unwilling to invest the time and effort to develop it.
A.
正确
B.
错误
【单选题】使用盐桥,将反应Fe2++Ag+ = Fe3++Ag设计成的自发电池是:
A.
Ag(s)|Ag+||Fe3+,Fe2+|Pt
B.
Ag(s)|AgCl(s)|Cl -||Fe3+,Fe2+|Pt
C.
Pt|Fe3+,Fe2+||Ag+|Ag(s)
D.
Pt|Fe3+,Fe2+||Cl -|AgCl(s)|Ag(s)
【单选题】The time and effort he has devoted during the past few years____ trees in that remote area is now considered to be of great value．
A.
to plant
B.
to planting
C.
plant
D.
planting
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