Conventional solar panels are 16 crystallized silicon, the same material used in computer chips.
答案：(C) made of
【句型】made of 字詞搭配「由……製成」，表示傳統太陽能板是由結晶矽製成的；accounted for（占比/解釋）、divided into（被分成）、taken as（被當作）都不合。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
四個選項都是「動詞加介系詞」的被動形式，中文是「占、被分成、由……製成、被當作」，如果沒把後面那個材料看清楚，會覺得 divided into 好像也說得通。
四個選項都是片語動詞，可見這一格考的是語意與搭配。先看空格後面接什麼：crystallized silicon（結晶矽），是製造面板的材料；再看下一句 the same material used in computer chips（與電腦晶片用的是同一種材料），直接點明那是「材料」。所以整句要說的是「傳統太陽能板是由結晶矽製成的」，填 made of。這裡正好可以把 made of 與 made from 分清楚，兩者常一起考：made of 用在材料的形態沒有改變、看得出原本是什麼（The table is made of wood. 這張桌子是木頭做的。）；made from 用在原料經過加工、已經看不出原貌（Wine is made from grapes. 葡萄酒是葡萄釀的。）。矽晶片在面板裡仍是矽，形態沒變，所以用 of。（84 年第 36 題考的正是另一邊——items made from myrtlewood，木頭被削磨成商品，形狀已經改變。）
divided into（被分成）：講的是一個整體被切成幾份，但矽是原料不是被切出來的部分。accounted for（占、解釋）：講比例或說明原因，be accounted for 的主詞應該是「被解釋的現象」，語意接不上。taken as（被當作）：講的是被視為什麼，但面板不是「被當成」矽，它就是用矽做的。
be made of（由……製成，看得出材料）、be made from（由……製成，原料已改變）、be made up of（由……組成）、account for（占；解釋）、be divided into（被分成）、turn A into B（把 A 變成 B）。
Solar panels can turn sunlight into electricity. Conventional solar panels are 16 crystallized silicon, the same material used in computer chips. But silicon is expensive and the panels are heavy. Facing this 17 , engineers at a Japanese company have developed a thin-film flexible solar panel. The new panel is not the first of its 18 , but it may be the most flexible—it bends like paper.
At one kilogram per square meter, this new type of panel weighs one tenth of conventional solar panels. 19 means it could be used in novel places, such as the roof of a tent, the walls of a building, or the top of a bus. Sheets of the material could be used to make portable, rollable battery chargers for mobile electronic 20 , like notebook computers or cellphones. As many countries are now pushing for green technology, the new flexible solar panels may spur a great demand.