当呼吸道防御功能受损害或全身免疫力下降时,才引起肺炎链球菌对肺泡的侵袭而致病。
参考答案:对
In the dining room of my grandfather’s house stood his heavy dock. Meals in the dining room were a (16) for our four generations to become one. My grandfather’s clock always stood like a trusted old family friend, (17) us playing jokes and telling stories, which was already a (18) of our life. When I was a child, the old clock interested me. I watched and listened to it during (19) I was surprised how at (20) times of the day, the clock would strike three times, six times or more, with a wonderful great (21) that echoed throughout the house. The clock chimed year after year, a part of my (22) , a part of my heart. Even more (23) to me was my grandfather’s special action each day. He meticulously (24) the clock with a special key each day. The key was magic to me. It (25) our family’s magnificent clock ticking and striking all year round.
Ⅱ.完型填空/Cloze
A.memories
B.minds
C.comfort
D.information
背拉力指数的计算公式是:背拉力指数=()
A.拉力(kg)/体重(kg)×100%
B.[拉力(kg)+体重(kg)]/2×100%
C.[体重(kg)-拉力(kg)]/2×100%
D.[体重(kg)-拉力(kg)]/3×100%
E.[体重(kg)-拉力(kg)]×100%