Although their new factory building is still under          construction, we have already placed        order for 200 pairs of shoes.

A．the; an

B．a; an

C．/; an

D．/; /

BRCA2基因突变可引起

A．乳腺癌

B．神经纤维瘤

C．恶性黑色素瘤

D．肾细胞癌