单项选择题

Children (who) form a positive self-concept are more assertive, optimistic, (confidence), and sociable (than those) who (do not).

A. who
B. confidence
C. than those
D. do not
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单项选择题
(In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits).
A. In
B. surroundings
C. are
D. limits
单项选择题
If he (was to come) here this afternoon, I (should ask) him to go to the party (held) by student (union).
A. was to come
B. should ask
C. held
D. union
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