在制作“洋葱鳞片叶表皮细胞临时装片”时,下列操作中,会使气泡多且不易染色的是 A

题型:选择题

问题:

在制作“洋葱鳞片叶表皮细胞临时装片”时,下列操作中,会使气泡多且不易染色的是

A.撕取的洋葱表皮过大

B.盖玻片的一边先接触到水滴

C.碘液滴在盖玻片的一侧

D.载玻片中央滴加生理盐水

考点:观察实验:观察洋葱鳞片叶表皮细胞植物细胞结构和功能
题型:选择题

Judy had very bad luck yesterday. In the morning, she came to school late, because her alarm clock didn’t go off. Usually she goes to school at 7:20 am. But yesterday, it was already 8:00 am when she got up. The teacher was angry(生气的) and asked her to stay in the classroom after school. At 5:00 pm, it was time for students to go home. But Judy couldn’t. She stayed until(直到) 5:30 pm. When she just went out of the classroom, it began to rain. She didn’t have an umbrella. On her way home, she fell off(摔下) her bicycle. When she got home, she was wet all through.

小题1:Judy was a(n)       .

A.teacher

B.student

C.doctor

D.actor小题2:What does the underlined “go off” mean?

A.出故障。

B.爆炸。

C.响。

D.停止。小题3:When did Judy’s classmates go home?

A.At 7:20 am.

B.At 8:30 am.

C.At 5:00 pm.

D.At 5:30 pm.小题4:How did Judy go home?

A.By bus.

B.By car.

C.By bike.

D.By train.小题5:Which is the best title?

A.Judy, a bad girl.

B.What a terrible day!

C.Judy’s school life.

D.A lucky day.

题型:选择题

妈妈今天买菜花了6.5655元.______.(判断对错)

题型:选择题

含C为O.37%~0.45%,Cr为O.8%~l.1%的铬钢是()。

A.37Cr

B.40Cr

C.45Cr

D.8Cr

题型:选择题

下列有关太阳辐射哪一种说法是正确的()。

A.太阳辐射强烈,蒸发面的温度就升高,饱和水汽压减小,饱和差减小,蒸发速度就大

B.太阳辐射强烈,蒸发面的温度就升高,饱和水汽压增大,饱和差减小,蒸发速度就大

C.太阳辐射强烈,蒸发面的温度就升高,饱和水汽压减小,饱和差增大,蒸发速度就大

D.太阳辐射强烈,蒸发面的温度就升高,饱和水汽压增大,饱和差增大,蒸发速度就大

题型:选择题

下列哪一项不是白盒测试?()

A.单元测试

B.集成测试

C.系统测试

D.回归测试

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