单项选择题

As an industry, biotechnology stands to______ electronics in dollar volume and perhaps surpass it in social impact by 2020.

A．contend
B．overtake
C．rival
D．strive
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单项选择题
All the off-shore oil explorers were in high spirits as they read______ letters from their families.
A．sentimental
B．affectionate
C．intent
D．sensible
单项选择题
I was unaware of the critical points involved in this issue, so my choice was quite
A．arbitrary
B．rational
C．melancholy
D．unreasonable
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