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Which one is the correct answer?
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Which one is the correct answer?
Which one is the correct answer?
Directions:In this section you will hear a recorded short passage. The passage is printed on the test paper, but with some words or phrases missing. The passage willbe read three times. The first reading is for you to get thegeneralidea. During the second reading, you are required to write down the missing words or phrasesaccording to what you hearin order of numbered blanks. Thethirdreading isfor you to check youranswer. Now the passage will begin.You can1 several scary sounds and2 during the festivities. A very largesheet of poster board or sheet metal makes great thunder (雷声).Uncooked rice pouredonto a cookie sheet sounds like3 . To get a good4 you can, well scream.Snap(咬)carrots in half for the sound of breaking bones. Flap (拍)a plastic bag 5 themicrophone for the sound of bats. Slowly blow bubbles with a straw into a bowl for thatbog（沼泽）sound.
在紫外光谱分析中许多化合物的吸收曲线表明，它们的最大吸收常常位于 200─400nm 之间，对这一光谱区应选用的光源为
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