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【判断题】
当边际效用下降为零时,总效用达到最大值。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】If you spend ______ time with a baby long enough, you'll get ______ feeling for how the baby is feeling.
A.
a a
B.
/ a
C.
the the
D.
the /
【单选题】—Do you always spend lots of time playing computer games? —No, but I spend much time my homework.
A.
in; on
B.
on; on
C.
on; in
D.
in; in
【简答题】全神贯注的
【简答题】How did you spend your holiday?英译汉
【简答题】a. 极感兴趣的;全神贯注的;专注的
【单选题】—Do you always spend lots of time playing computer games? —No, but I spend much time my homework. [ ]
A.
on; in
B.
on; on
C.
in; on
D.
in; in
【单选题】It's about time you ______ a little less money.
A.
spend
B.
to spend
C.
spent
D.
had spent
【简答题】集中;全神贯注
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