本文選自雅思聽力Section 4，難度較大

Summary:味精是許多人在烹調(diào)的時(shí)候會(huì)使用的調(diào)料，但卻很少有人了解它的歷史。實(shí)際上，許多種調(diào)料在進(jìn)入人類的廚房之前都經(jīng)歷了一個(gè)復(fù)雜而又曲折的過程。味精也是一樣，它最先是由人們在一種還槽中提煉出來的。

HINTS
MSG
Monosodium Glutamate
amino
erm

文中有一處連詞符

全文聽寫，英式拼法

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So what exactly is MSG? Well, Monosodium Glutamate contains 78.2% glutamate, 12.2% sodium and 9.6% water. Glutamate is an amino acid that can be found naturally in all protein-containing foods, erm, so this includes food such as meat and cheese. It is widely known that Chinese and Japanese food contains MSG but many people don't seem to be aware that it is also used in foods and other parts of the world. For example it is found in commercially made Italian pizzas, in American fast food and in Britain MSG is used in things like potato crisps.