脑啡肽是一种具有镇痛作用的药物，它的基本组成单位是氨基酸。下面是脑啡肽的结构简式，形成这条肽链的氨基酸分子数、脱去水分子数、氨基酸种类数分别是( )
—____________ is it? —It's yellow. A. Which color B. What color C. What
I'm really sad because I ____________ my bike. A. use B. lost C. loses
Leaves ____________ many jobs. A. has B. have C. haves
Flowers ____________ the seeds. A. making B. makes C. make
Little seeds grow up ____________ plants and trees. A. to B. to be C. be
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