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【简答题】
已知向量 a =（cosθ，sinθ）和 b=( 2 -sinθ，cosθ) ． （1）若 a ∥ b ，求角θ的集合； （2）若 θ∈( 5π 4 ， 13π 4 ) ，且| a - b |= 3 ，求 cos( θ 2 - π 8 ) 的值．
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举一反三
【单选题】Look! This is an _____ .And that is an _____ . [ ]
A.
orange; banana
B.
egg; hamburger
C.
apple; egg
D.
egg; pear
【简答题】退保是指由（ ）提出的保险合同的解除。
【单选题】What do you eat for your meal? --- I eat ______ .
A.
a egg and some breads
B.
an egg and some bread
C.
an egg and some breads
【简答题】非霍奇金单克隆抗体靶分子（）。
【简答题】25-year-old Peng Nan has clinched the title “International of Memory” for her a____ _________ memory skills.
【单选题】25-year-old Peng Nan has clinched the title “International Master of Memory” for her ____ memory skills.
A.
amazing
B.
amazed
C.
amaze
D.
amazemnet
【单选题】This is _______ egg. _______ egg is big. [ ]
A.
an; An
B.
the; The
C.
an; The
D.
the; An
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