凡是由()引起,具有一定潜伏期和临床表现,并具有传染性的疾病称为传染病。
参考答案:病原微生物
属纯粘液腺的小涎腺是
A.唇腺
B.颊腺
C.味腺
D.磨牙后腺
E.腭腺
—You are standing too near to the TV. Can you move a bit ______?
—OK, Mom. Is it all right here?[ ]
A. faster
B. slower
C. farther
D. nearer