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【简答题】
若等差数列{a n }的首a 1 ，公差为d，前n项的和为S n ，则数列{ S n n }为等差数列，且通 S n n =a 1 +（n-1） d 2 ．类似地，请完成下列命题：若各项均为正数的等比数列{b n }的首b 1 ，公比为q，前n项的积为T n ，则数列______为等比数列且通______．
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举一反三
【单选题】I'll phone you in my lunch ____________ about the company's ____________ dinner for the volunteers.
A.
break; potluck
B.
chocolates; goodies
C.
recogniton; awards
D.
team; spirit
【单选题】I'll phone you in my lunch ____________about the company's potluck dinner for the volunteers.
A.
rest
B.
break
C.
broke
D.
broken
【简答题】8) I'll phone you in my lunch
____________ about the company's ____________ dinner for the volunteers.A. break ; potluck B. recognition C. effort D. awards
【简答题】I'll phone you in my lunch break about the company's ____________ dinner for the volunteers.
【简答题】I'll phone you in my lunch _____ about the company's ______ dinner for the volunteers.
【简答题】I'llphone you in my lunch ______ (break) about the company's _______(potluck) dinner for the volunteers.
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