19．_______ ninety-nine percent of the panda's diet is bamboo，it also eats corn，
apples and sweet potatoes．（　�。�
A．IfB．WhileC．BecauseD．Since

分析 盡管熊貓百分之九十九的食物是竹子，但是她也吃玉米，蘋果和紅薯．

解答 答案：B．
由also可知，前面的句子應(yīng)該是一個讓步狀語從句，可以用while來引導(dǎo)，While意為當(dāng)什么時候，或者盡管，可以引導(dǎo)時間狀語從句或者讓步狀語從句；If如果，是否；多引導(dǎo)條件狀語從句；Because因為，由于；以及Since因為，自從都可引導(dǎo)原因狀語從句，since還可引導(dǎo)時間狀語從句．故選B．

點評 本題考查讓步狀語從句的連接詞，在充分分析句型再結(jié)合語義的基礎(chǔ)上便能選出正確答案，同時要注意其他選項的意思

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