Storage onions, on the other hand, are available August through April. 24 fresh onions, they have multiple layers of thick, dark, papery skin.
答案：(A) Unlike
語意對比：「跟新鮮洋蔥不同，它們（儲存洋蔥）有好幾層厚實深色的紙質外皮」，Unlike（不像）符合這種對比；Through（透過）、Besides（此外）、Despite（儘管）都不合。
Despite 很誘人，因為它和 Unlike 一樣會出現在句首、後面一樣接名詞，而且「儘管」和「不像」在腦中都掛著轉折的標籤。Besides（此外）也常被挑走，因為前面剛講完新鮮洋蔥、這裡接著講儲藏洋蔥，看起來很像在補充。
先看這一句在整篇的位置。前面講新鮮洋蔥：thin, light-colored skin（薄而顏色淺的外皮）。這一句講儲藏洋蔥：multiple layers of thick, dark, papery skin（好幾層厚實、深色、如紙般的外皮）。薄對厚、淺對深——這是對比，兩者不一樣。更前面一句還插好了旗子：Storage onions, on the other hand, are available August through April. on the other hand 已經宣告要講「另一面」，這一句是同一個對比的延續。Unlike 是介系詞，意思是「不像…、與…不同」，後面接名詞，正好用來標示這種差異，整句是「與新鮮洋蔥不同，它們有好幾層厚實深色的外皮」。這一題的鑑別度高達 77，是全站最高的幾題之一。它分的不是單字，而是「有沒有看出這一整篇都在做兩種洋蔥的對照」——讀懂結構的人一眼就選，沒讀懂的人四個都覺得可以。
Through：透過、穿過，表示方式或路徑，與比較無關。Besides：除…之外還有，是把東西加上去；但這一句不是在替新鮮洋蔥補充特徵，而是在講另一種洋蔥的不同之處。Despite：儘管，表讓步，後面接的東西要與主要子句形成「照理說應該…卻…」的落差；fresh onions 和「有厚外皮」之間沒有這種讓步關係。
unlike（與…不同，介系詞）、on the other hand（另一方面）、despite（儘管，後接名詞）、in spite of（儘管）、multiple layers of（好幾層的…）、be divided into two categories（分成兩類）。
Onions can be divided into two categories: fresh onions and storage onions. Fresh onions are available 21 yellow, red and white throughout their season, March through August. They can be 22 by their thin, light-colored skin. Because they have a higher water content, they are typically sweeter and milder tasting than storage onions. This higher water content also makes 23 easier for them to bruise. With its delicate taste, the fresh onion is an ideal choice for salads and other lightly-cooked dishes.
Storage onions, on the other hand, are available August through April. 24 fresh onions, they have multiple layers of thick, dark, papery skin. They also have an 25 flavor and a higher percentage of solids. For these reasons, storage onions are the best choice for spicy dishes that require longer cooking times or more flavor.