選B,首先the more后面要加名詞medicine.I take是來修飾medicine的,作為定語.接下來是the more的用法:
漢語中表示兩個過程按比例同時增加時,用“越……越……”結構.英語中用“the +比較級,the+比較級”結構.這種結構通常從句在前,主句在后,即：第一個the+比較級為狀語從句,第二個the+比較級為主句.句型中的連個“the”都是指示副詞.兩個“the”的后面都必須跟形容詞或副詞的比較級形式.不過有的語法書中說“第一個the引導的句子是比較狀語從句”.
這種結構中的謂語動詞一般情況下：主句用將來時態(tài),從句用一般現(xiàn)在時態(tài)（代替將來時態(tài)）.
試比較下列例句的用法:
1.The more,the better.多多益善.
2.The sooner,the better.愈快愈好.
3.The more you learn,the more you wish to leaarn.
你學得越多,你越是想學.
4.The sooner you start,the sooner you will finish.
你開始的越早,你就完成得越快.
5.The more exciting it is,the happier they are.
越是有趣,他們就越是高興.
6.The more I know him,the more I like him.
我越認識他,就越喜歡他.
7.The more you read,the better you understand.
你看的書越多,你懂得就越多.
8.The hotter the air is,the more quickly it will rise.
空氣越熱,它就上升得越快.
9.The more learned a man is ,the more modest he usually is.
一個人越有學問,就往往越謙虛.
10.The more you know ,the more you will realize how little you know.
知道得越多,越會體會到自己知道得有限.
注意：
有時這種句型中主句用主謂倒裝形式.
例如：
The smaller the house is ,the less will it cost us to heat.
房子越小,花的取暖費就越少.
The more we thought of the lost boy,the more did we get worried.
我們越想那個丟失的孩子,就越是著急.