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问题 选择题

下图表示“制作人口腔上皮细胞临时装片”实验的部分操作步骤，步骤①和②中滴加的分别是（   ）

A．清水、清水　

B．碘液、清水　

C．生理盐水、碘液

D．碘液、碘液

答案

答案：C

为了保持细胞的形态，滴加的是生理盐水，染色是用碘液染色的。

解答题
直接写得数．
70×110=23×11=130-70=630÷9=
129+135=160×40=12×60=70×80=
95+0=87×0=12×11=40×15=
560÷4=498×22≈505×39≈99×999≈
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听力题

词汇应用

Brian was not good at public speaking. One day, he   1  (invite) to make a speech at a church. His  2  (young) sister, Ann knew he was nervous and tried to calm him down. "Don't worry. Everything  3  (be) fine. " When the day came, Brian's car had an accident on the way to the church. Luckily, he was not  4  (bad) hurt and arrived at the church on time. It was  5 (he) turn. When he stood up, hit coat became tangled with his chair. After a few 6  (minute), he finally began his speech. but he was so nervous that he dropped his book. Many people thought he would run, but he went on.

Suddenly, people saw something   7  (usual)   8  (run) down from his nose, blood! He stopped _9_ (speak) when he saw the blood. But he still tried to finish his still tired to finish his speech. Then Ann quietly moved to the front and handed him her handkerchief. Then she gave him a smile and   10  (return) to her seat,

It was a   11  (real) simple gesture, and might be the   12  (simple). She just saw someone in need, and gave him a hand. In the end, Brian finished his talk, with more confidence.

小题1:______ ___ 小题2:__________ 小题3: _________ 小题4:______ __小题5:_____ 小题6: ______小题7: ________小题8:________小题9: ___________ 小题10: __________ 小题11: _________ 小题12:___________
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