问题
选择题
It is reported that ______ number of college students ______ growing year by year.
A．a; are
B．the; is
C．the; are
D．a; is
答案
答案：B
考查：the number of +复数名词作主语，谓语动词用单数形式，意为：……的数量是，句意：据报道许多大学生的数量在逐年增长。故选B。
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则能与该载体连接的抗病基因分子末端是_________。