单项选择题

The main idea of this passage is ______.

A．what the future of health care is like
B．how online doctors operate on patients
C．first-aid kit found wider uses
D．bandwidth is the limiting factor for transmitting images

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单项选择题

The main function of the barbed wire is ______.

A．fencing attracted cattle
B．that cattle shield away from the barbed wire
C．making cattle grow more quickly
D．that the garden could be used as a parking lot

单项选择题

Few people realize that ______.

A．the Old West period wasn’t as long as most people think
B．cowboys contributed to the end of the Old West
C．cowboys played an important part in the Old West
D．the Old West lasted only 19 years