下图表示再生能力很强的原生动物喇叭虫,将它切成三截(图中a:纤毛.b:大核;c:根部),能再生成喇叭虫的是
A.①
B.②
C.③
D.①②③
答案:B
—Can we finish the work with ______ money and ______ people?
—I'm afraid it's impossible.
A.less; fewer
B.few; less
C.less; less
D.fewer; fewer
聚乙二醇在固体分散体中的主要作用是
A.增塑剂
B.促进其溶化
C.载体
D.粘合剂