正确答案: ABCD

吗啡中毒 感染中毒性休克 一氧化碳中毒 氰化物中毒

题目：中毒性呼吸困难，可由下列哪几项引起 （ ）

解析：ABCD

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举一反三的答案和解析：

[单选题]胸外心脏挤压时，应使胸骨下陷( )

4～5cm

[单选题]What is the typical American family (21) ? Married American adults will name their husband or wife and their children (22) their "immediate family"(直系家庭). If they (23) their father, mother, sisters, or brothers, they will define them as separate units, usually (24) in separate households. Aunts, uncles, cousins, and grandparents are (25) "extended family"(扩大的家庭).The structure of the American family has undergone great changes (26) the 1950s. Traditionally, the American family (27) been a nuclear family, consisting (28) a husband, a wife, and their children. Grandparents (29) live in the same home with their (30) sons and daughters.

like

解析：

本题是词汇题，考查“like”的介词用法，“像，以……的典型方式”，应该是“be+like”，故选 C。