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+ Vật nhiễm điện còn gọi là gì? + Chiếc lược nhựa sau khi cọ xát vào mảnh vải khô, thanh thuỷ tinh sau khi cọ xát vào mảnh lụa, mảnh nilon, mảnh phim sau khi được cọ xát vào len, có khả năng gì? + 2 vật sau khi cọ xát vào nhau rồi tách chúng ra, có hiện tượng gì xảy ra? Thanks,giúp mình nh
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· For questions 1-15, read the text below and write the word which best fits in each space. Use only one word in each space. ║ Pre-History That fragment of pottery, that little piece of bone, or the remains of an early human tool are (1) ..... often the only evidence we have of our early history. However, (2) ..... a consequence of the work of archaeologists and others in this field, we have (3) ..... the years built (4) ..... an extremely good understanding of early human development. This is the case (5) ... the fact that there is no written evidence of the period we term Pre-History. (6) ..... is startling to note is that this period, which predates the invention of writing, accounts (7) ..... 99% of human existence. It was (8) ..... this time that discoveries that shaped the human race were made, early settlements created that (9) ..... to become our major cities and (10) ..... general was the time when the very foundations of human civilization were laid. The evidence of our pre-history can be found everywhere, from remnants of human existence buried deep in the ground (11) ..... ancient pathways and burial grounds. The first and easiest place to start your exploration of prehistory is of (12) ..... your local museum, particularly (13) ... you are interested in discovering more about the area where you live. You may (14) ..... have a local archaeological group that would be prepared to let you work (15) ..... a volunteer.

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