题目内容

2.674÷681.909

A. 0.003921344

B. 0.00392134

C. 0.0039213

D. 0.003921

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2.679×680.047

A. 1822
B. 1821.8459
C. 1821.846
D. 1821.8

将1.6500修约到小数点后一位为;2.353修约到整数为;

Dictation: listen to the audio and fill in the blanks.[音频]FROM PANT-PANT TO HA-HALook at the photo. Does this look like laughter? New research says that apes laugh when they are tickled. A __1_ at the University of Portsmouth in the U.K. _2_ a "tickle team". The team tickled the necks, feet, hands, and armpits of young apes. The team 3_ more than 800 of the resulting laughs on tape. The research suggests that the apes' panting noise is the _4 of _5_.Researchers think that this short, quick breathing is the starting point of human expressions of _6_---the "ha ha" sound we make when we laugh. When we find something _7, such as a joke, we laugh. When apes find something amusing, such as a tickle, they laugh. Humans find many __8 funny—such as jokes, tickles, TV _9_ shows—but we are not unique because animals laugh, too.

在脉冲电路中，常应用微分电路把矩形脉冲变换为_____脉冲。