In paragraph 2, the author explains the concept of vasodilation and vasoconstriction by
A．describing the evolution in our ancestors
B．giving an example of heat loss in the extremities
C．comparing the process in humans and animals
D．identifying various types of insulation
You can drive your own car __ you have passed the driving test.
A．even if
B．as if
C．now that
D．so that
A．Juice.
B．Tea.
C．Coffee.
D．Beer.
What is perhaps the unique skill that dogs possess？
A．Dogs can be domesticated.
B．Dogs can communicate with wolves.
C．Dogs can communicate with humans.
D．Dogs can be raised in the wild first and later still be domesticated.
Two new bridges __ on the river by the end of next year.
A．will be built
B．will have been built
C．are going to be built
D．have been built
In paragraph 4, the author suggests that Beowulf was discovered in the
A．first century
B．ninth century
C．eleventh century
D．seventeenth century