題型三：(第 46 至 48 題) 下面三篇段落各有四個劃底線的句子，每個句子前有選項代碼，分
別為 (A)、 (B)、 (C)、 (D)。請依各段落內容，選出一個文意最不連貫的句子，並將該句子之
選項代碼劃在答案卡上。 【題組】47. We take our smoothly paved highways and streets for granted as products of technology and
engineering. They are made of concrete, a building material composed of cement, sand or
gravel, and water. (A) The huge concrete channel supplied drinking water to ancient Rome.
(B) The cement in concrete has a long history. The Egyptians burned chips from the Great
Pyramid and used the resulting ash as mortar. (C) The Romans made a cement out of volcanic
ash, which they turned into concrete by mixing it with water, lime, and rock; they used cement
in the Great Aqueduct about 2000 years ago. (D) Today, concrete mix containing sand is used
for smooth applications; gravel mix is used where a stronger concrete is required.
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