题干

下表为某同学探究“光照对鼠妇生活的影响”的实验设计.以下修改意见正确的是(  )

 位置

 鼠妇数量

 光照

 温度

 湿度

 纸盒左半侧

 10只

 明亮

 5℃

 适宜

 纸盒右半侧

 10只

 黑暗

 25℃

 适宜

A:左右两侧的温度都应设置为25℃

B:左右两侧都应设置为黑暗环境

C:左右两侧的湿度可以不同

D:左右两侧的鼠妇数量可以不同

上一题 下一题 0.0难度 选择题 更新时间:2013-02-18 01:02:40

答案(点此获取答案解析)

A

同类题5

阅读理解

    Getting on the school bus, like the possible dangers around the home, getting on the school bus can also bring its own set of dangers. There are several important safety measures that parents should be aware of when it comes to bus safety.

    Parents should always make sure that someone is taking charge of children at the bus stop to make certain clear ground rules which are in place and are being followed—particularly rules that forbid horseplay in and around the street.

    Teach children to ask the bus driver for help in picking up anything they may have dropped around the bus, as children getting dropped articles are often hit by the bus or another vehicle because they are not seen by the bus driver or by oncoming traffic.

    Children should be asked to take five large steps away from the bus when they get it off, and make sure that the bus driver can see you and look you directly in the eyes to signal it is OK to cross the street. It is still very important that children also look both ways as they cross the street.

    Inform children that they must never speak to any stranger who talks with them first and that they must never accept a ride from any person unless their parents tell them directly that it is OK. Teach kids that adults should ask other adults for help, not kids. If an adult asks a kid for help, that child should get another adult.

    If for any reason a child feels uncomfortable or unsafe at the bus stop they need to bring it to a parent's or caregiver's attention.

Remember, planning ahead is always the best safety measure. Follow these rules and your family will be off danger!