【单选题】临床上药物的治疗指数是指 A. ED 50 /LD 50 B. LD 50 /ED 50 C. LD 5 /ED 95 D. ED 95 /LD 5 E. LD 1 /ED 95

Who is “Dee”?

The<br/>climax of “Everyday Use” occurs when ____. A: the<br/>mother takes the quilts from Dee and gives them to Maggie B: Dee's<br/>boyfriend arrives C: Dee<br/>makes dinner for her boyfriend D: Dee sets fire to the house

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The climax of the short story Everyday Use is ______. A: Dee taking pictures of the house B: the argument over the quilts C: the dinner D: Dee's leaving

ask(ed) A: want(ed) B: pleas(ed) C: carri(ed) D: help(ed)

2. Dee(Wangero)and Maggie have very distinct personalities.

The daughter’s name is . A: Frank B: Dee C: Polly

Why do Dee and Mama disagree? ____ A: Mama<br/>places little value on education or hard work. B: They<br/>have different ideas about what is important in life. C: Mama<br/>resents Dee for setting the fire that burned down their first house. D: Dee<br/>and Mama both want everything for themselves.

可靠安全系数是指（） A: LD/ED B: ED/LD C: LD/ED D: LD/ED E: ED/LD