乙型肝炎的主要传播途径是()
A.消化道传播
B.血液、血制品传播
C.呼吸道传播
D.直接接触
E.蚊虫叮咬
参考答案:B
The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strain (过度紧张).
A.to compete
B.competing
C.to be competed
D.having competed
当女性的一侧卵巢受损失去功能或手术摘除后,这位女性就会失去生育能力.______.(判断对错)