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问题 单项选择题

男，22岁，贫血，黄疸，脾肿大。血红蛋白70g/L，白细胞5.5×109/L，网织红细胞 计数0.09，Coombs试验阳性

A．缺铁性贫血
B．巨幼细胞性贫血
C．自身免疫性溶血性贫血
D．珠蛋白生成障碍性贫血

答案

参考答案：C

单项选择题

如图所示，物体在恒力F作用下沿曲线从A运动到B，这时突然撤去恒力后物体运动情况，下列说法正确的是（）

A.物体可能静止在B点

B.物体可能沿曲线Ba运动

C.物体可能沿曲线Bc运动

D.物体一定沿直线Bb运动
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单项选择题

It’s all annual back-to-school routine. One morning you wave goodbye, and that (1) evening you’re burning the late-night oil in sympathy. In the race to improve educational standards, (2) are throwing the books at kids. (3) elementary school students are complaining of homework (4) What’s a well-meaning parent to do.As hard as (5) may he, sit back and chill, experts advise. Though you’ve got to get them to do it, (6) helping too much, or even examining (7) too carefully, you may keep them (8) doing it by themselves. "I wouldn’t advise a parent to check every (9) assignment," says psychologist John Rosemond, author of Ending the Tough Homework. "There’s a (10) of appreciation for trial and error. Let your children (11) the grade they deserve. " Many experts believe parents should gently look over the work of younger children and ask them to rethink their (12) . But "you don’t want them to feel it has to be (13) ," she says.

That’s not to say parents should (14) homework-first, they should monitor how much homework their kids (15) . Thirty minutes a day in the early elementary years and an hour in (16) four, five, and six is standard, says Rosemond. For junior-high students it should be " (17) more than an hour and a half," and two for high school students. If your child (18) has more homework than this, you may want to check (19) other parents and then talk to the teacher about (20) assignments.

9（）

A.single

B.piece

C.page

D.other
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