填空题

S1

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填空题
(S2) Para. 2 tells us about some __________.
单项选择题
A．They are very. rewarding.B．They are too time-consuming.C．They are not helpful at all.D．They are too troublesome.
A．They are very. rewarding.
B．They are too time-consuming.
C．They are not helpful at all.
D．They are too troublesome.
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