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【多选题】
下列关于海面强度的描述，正确的有（ ）。A．与发射声强度、发射信号脉冲宽度、发-收换能器组合指向性等量成正比B．与时间的一次方成反比C．与时间的平方成反比D．与时间的三次方成反比A.
A
B.
B
C.
C
D.
D
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举一反三
【简答题】Karen and Kevin work in a hospital . They (do not/does not) go to school.
【单选题】What information can be got about Estonia from the passage?
A.
It restricts free access to Internet.
B.
Free Wi-Fi is set up all over the country.
C.
It is impossible for other countries to follow its suit.
D.
Its people can get free Wi-Fi access almost everywhere.
【简答题】Karen and Kevin work in a hospital . They (don't/doesn't) go to school.
【单选题】Karen and Kevin work in a hospital. They ______ to school.
A.
not go
B.
don't go
C.
no go
D.
doesn't go
【简答题】Christmas was just a week away and I had five people left to shop for but only three dollars. 'Let's set a price limit on our gifts this year,'I suggested to my best friend Joanie. 'That's a good idea...
【单选题】Karen and Kevin _________ at the hospital.
A.
work
B.
works
C.
is working
D.
is worked
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