28.D

Thông tin: In fact, all of these modern conveniences are of such recent development that you might well wonder how electricity could be any older than Thomas Edison's development of the first practical electric light bulb in 1879

29.A

Thông tin:

+The first discovery of electricity is over 2,600 years old.

+The word electricity comes from the Greek word meaning amber, which is electron.

+More than two thousand years after Thales, an English physician discovered that other substances also had this characteristic of electricity

30.C

Thông tin: In fact, all of these modern conveniences are of such recent development that you might well wonder how electricity could be any older than Thomas Edison's development of the first practical electric light bulb in 1879

31.D

Thông tin: The word electricity comes from the Greek word meaning amber, which is elektron.

32.B

Thông tin: The fossilized sap of a pine tree, amber looks much like a hard lump of honey.

*Xin hay nhất

`28.` `D`

`+)` Thông tin: In fact, ..... `1879`

`29.` `A`

`+)` Thông tin:

 `-` The first .... years old.

 `-` The word .... is electron.

 `-` More than .... electricity

`30.` `C`

`+)` Thông tin: In fact, ..... `1879`

`31.` `D`

`+)` Thông tin: The word .... is electron.

`32.` `B`

`+)` Thông tin: The fossilized ..... of honey.

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