A．clothB．silkC．nylonD．wool

下列程序段中哪一组将a，b变量值交换？（)（A) a=a－bb=a＋ba=a－b（B) b=a＋ba=a－bb=a－b（C) a=a＋bb=a－ba=

Linda wore a （) skirt yesterday.A、red beautiful silkB、beautiful red silkC、beautiful silk

This sweater is made of______ wool and is much warmer than other kinds of sweater.A．sheerB

New Zealand is the worlds largest exporter ofA．dairy products.B．fish.C．wool.D．beef.

Australia is the worlds largest exporter ofA．wheat.B．dairy products.C．meat.D．wool.

不属于软膏剂油脂性基质的是（)A．Sodium lauryl sulfateB．Liquid ParaffinC．Wool fatD．Beeswa