题目内容

下列哪项不是小儿呼吸系统的特点

A. 呼吸道最狭窄部位在声门裂
B. 气管分叉角度两侧基本相同
C. 声门下腔黏膜下层疏松,易发生水肿
D. 会厌硬挺不易抬起

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The meaning of the word “nice" changed a few times______ it finally came to include the sense “pleasant”.-

A. before
B. after
C. since
D. while

She found her calculator______ she lost it.

A. when
B. where
C. then
D. there

You should make it a rule to leave things______ you can find them again.

A. where
B. when
C. in which
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It was quiet______ those big trucks started coming though the town.

A. before
B. after
C. until
D. unless

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