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【判断题】
艾滋病的传播途径主要有三条：一是性接触传播;二是血液传播;三是母婴传播。艾滋病病毒不能在昆虫体内繁殖和生存。因此，即使艾滋病病毒进入蚊子或其它昆虫体内，也不会感染，也不会通过叮咬人而传播。()A.
正确
B.
错误
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【单选题】The particular price that results in quantity supplied being equal to quantity demanded is the best price because it
A.
maximizes costs of the seller.
B.
maximizes tax revenue for the government.
C.
maximizes the combined welfare of buyers and sellers.
D.
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【单选题】We can’t afford ______ such an important customer. [ ]
A.
upset
B.
to upset
C.
upsetting
【简答题】科氏加速度是由(____)运动与(____)运动相互影响产生的。
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