—— ________is this dress ?
——It's twenty yuan .
A:How many
B:How old
C:How much
下列研究动物行为的方法,属于实验法的是( )
⑴____ A. vacation B. exam C. David D. favorite
⑵____ A. most B. post C. host D. cost
⑶____ A. seem B. feel C. coffee D. between
⑷____ A. however B. blow C. brown D. now
⑸____ A. clearly B. hear C. learn D. near