The population of many Alaskan cities has ______ doubled in the past three years.

A．as great as

B．as many as

C． more than

D．larger than

下列关于机动车商业保险示范条款的表述，不正确的是（）。

A.保险条款分为主险、附加险

B.本保险合同中的被保险机动车包括摩托车、拖拉机等

C.附加险不能独立投保

D.附加险条款与主险条款相抵触之处，以附加险条款为准，附加险条款未尽之处，以主险条款为准