单项选择题

A．How animals survive harsh conditions in the wild.
B．How animals alter colors to match their surroundings.
C．How animals protect themselves against predators.
D．How animals learn to disguise themselves effictively.
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单项选择题
A．He does not know how to open the computer.B．He does not know how to send an E-mail.C．He does not know how to write an E-mail.D．He does not know how to change a word.
A．He does not know how to open the computer.
B．He does not know how to send an E-mail.
C．He does not know how to write an E-mail.
D．He does not know how to change a word.
单项选择题
A．Why her parents wanted to go to Gettysburg.B．Why her family’’s vacation plans changed ten years ago.C．Where her family went for a vacation ten years ago.D．When her family went on their last vacation.
A．Why her parents wanted to go to Gettysburg.
B．Why her family’’s vacation plans changed ten years ago.
C．Where her family went for a vacation ten years ago.
D．When her family went on their last vacation.
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