漏睛疮相当于西医学的（） A.溃疡性睑缘炎 B.角膜溃疡 C.角膜穿孔伤 D.慢性泪

读短文，补全句子。

    It's Saturday today. It's seven in the morning. My mother is doing morning exercises and my father  is  

cooking  breakfast. Grandpa is reading the newspaper. Grandma is watering the flowers. My brother Jack

is still sleeping. I'm writing an e-mail to my new friend, John. We are ready for the weekend.

1._______ reading the newspaper.

2._______ writing an e-mail.

3._______ sleeping.

4._______ cooking breakfast.

5._______ doing morning exercises.

设集合A={1，2，3}，B={a²+2，a+4}，A∩B={1]则实数a=______．

15℃时，空气中的声速为______m/s；此时小磊看到闪电5s后听到雷声，估算可知，打雷处与他相距______m．

比较同一温度下的不同微生物D值，其愈小，表示在该温度下杀死90%微生物需时愈长，即该微生物愈耐热。

下列《进学解》中的词语，可解释为精心造就人才的是：（）。

A.刮垢磨光

B.细大不捐

C.爬罗剔抉

D.贪多务得