Cats use ______ to help them navigate in a dark environment.
A. tails
B. fur
C. whiskers
D. toes
食材现代药理研究，每人每天食用多少克的鲜番茄即可满足人体对几种维生素和矿物质的需要？（）
A. 50-100克
B. 100-150克
C. 150-200克
D. 200-250克
They bargained for half an hour, and of course in the end Mr. Boggis got the chairs and agreed to pay her something ______ a twentieth of their value.
A. more than
B. at
C. less than
D. at least
下列属于绿豆芽的功效的是？（）
A. 清热解毒
B. 调五脏
C. 利尿除湿
D. 温阳益气
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