4G主套餐除了（）套餐仅对全球通客户开放外，均对全品牌客户开放
A、上网套餐
B、商旅套餐
C、飞享套餐
D、4G无线宽带套餐
参考答案：B
以下哪些设置会导致旺旺无法接收所有会话消息？（）
A.只接收旺旺好友消息
B.不接受陌生人消息
C.不接受陌生的E客服子账号的消息
D.启动了防骚扰功能
The total cost for Company X to produce a batch of tools is $10,000 plus $3 per tool. Each tool sells for $8. The gross profit earned from producing and selling these tools is the total income from sales minus the total production cost. If a batch of 20,000 tools is produced and sold, then Company X’s gross profit per tool is （）
A．$3.00
B．$3.75
C．$4.50
D．$5.00
E．$5.50
