把(+5)﹣(+3)﹣(﹣1)+(﹣5)写成省略括号的和的形式是[ ]
A.﹣5﹣3+1﹣5
B.5﹣3﹣1﹣5
C.5+3+1﹣5
D.5﹣3+1﹣5
答案:D
Maria, I have some exciting news ______ you. [ ]
A. to tell
B. telling
C. talk
用物理或化学方法将所有致病和非致病的微生物、细菌的芽孢全部杀死的操作,称为()
A.消毒
B.抑菌
C.灭菌
D.防腐
E.杀菌