Is there any______they' 11 ever find a cure for the common cold？
A. prospective
B. prospect
C. prosperity
D. prosperous
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According to the passage, the two students failed in their study because of their______.
A. shyness
B. proudness
C. self-doubt
D. laziness
A．onB．forC．asD．to
A. on
B. for
C. as
D. to
The last sentence of the passage implies that______.
A. the seasonal pattern has an impact on food values
B. the seasonal pattern determines a person's life expectancy
C. the seasonal pattern still influences life expectancy even if nutrition improves at all times of the year
D. the seasonal pattern will not change even if nutrition has improved much in modern age
每块以太网卡都有一个全球唯一的MAC地址，MAC地址由6个字节组成。（）
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