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问题 单项选择题

急性再生障碍性贫血的血小板一般小于

A．5×109/L
B．10×109/L
C．15×109/L
D．20×109/L
E．25×109/L

答案

参考答案：D

解析：急性再生障碍性贫血的血小板一般＜20×109/L。

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命题“若A=B，则A⊆B”及其逆命题，否命题，逆否命题这四个命题中，真命题的个数是______．
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从方框中选词并用其适当形式填空。

write,        read,        have,        something,        do

1. I ________ a party for my friend in the park last weekend.
2. She doesn't feel well, and she doesn't want to eat ________.
3. It's time ________ sports.
4. Jim ________ a letter to his pen pal once a month last year. 
5. I helped my son do some ________ yesterday evening.
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