题目

—I’m afraid a car is too expensive for me. —But more and more Chinese can        to buy one. A. expect              B. afford        C. choose             D. offer 答案： B 3．下列一组粒子的中心原子杂化类型相同，分子的键角不相等的是（　　）A．CCl4、SiCl4、SiH4B．H2S、NCl3、CH4C．BCl3、CH2═CH2、环己烷D．SO3、C6H6（苯）、CH3C≡CH