由拉杆、刀承两端孔过大造成的案秤示值无规律变动，可通过（）使之排除。A.缩小刀承两端

向含有0.2 mol NaOH和0.1 mol Ba(OH)₂的溶液中持续稳定地通入CO₂气体，当通入气体为8.96 L(0 ℃，1.01×10⁵Pa)时立即停止，则这一过程中，溶液中离子的物质的量与通入CO₂气体的体积关系图像正确的是(气体的溶解和离子的水解忽略不计)(  )。

在选购地板时，消费都很关心地板散发的气味，因为地板的刺激性气味强，往往是有毒有害物质超标的一种表现，最近有一种据称是香味环保地板赢得了不少消费者的青睐。销售人员声称地板散发的香味可以消毒杀菌，去除空气中的异味。当销售人员在推销这种产品时，往往会拿来几种不同的地板，让有购买意向的消费者闻一闻，并指出散发着清香气味的地板，即是香味环保地板。以下哪项如果为真，最能削弱销售人员的观点（ ）

A．气味并不是判别地板是否环保的唯一标准，除气味外，消费者更关心地板中有机挥发物的含量

B．事实上，由于木材本身的气味以及受制造工艺所限，地板或多或少都带有一定的刺激性气味

C．到目前为止，国家有关部门还没有出台香味环保地板的专门标准，所谓的“香味”不过是厂家炒作的概念

D．检验证明，不少厂商是通过在地板中添加大量香精等化学助剂来达到掩盖或者中和刺激性气味的目的

下列工业部门属高新技术产业的是[ ]

A、石油化工

B、钢铁工业

C、造纸业

D、计算机软件制造业

For better eyesight, doctors advise limiting the hours of screen time and encourage having enough eye resting time.

However, another study shows that sitting in front of computer or TV screens for long hours is not the only reason for myopia（近视）. An Australian research team studied young children in Sydney and Singapore to find the reasons for myopia.

The research team found that the prevalence（流行）of myopia among children in Sydney was lower than children in Singapore, even though they spent more time in front of computer and TV screens. The major finding is that children in Sydney spend longer hours on outdoor activities than those in Singapore.

Indoor and outdoor sports activities both make the eyes focus on more distant objects, which prevents the eyes from changing shape. But outdoor activities may better help avoid myopia than indoor sports activities.

Jane Gwiazda, who does research in sight problems, says: “Natural light is good for eye growth. And extra vitamin D from the sun might contribute to eye growth.”

Many doctors suggest that every child get its first eye test done when he/she is about two and half years old, and even if his/her sight seems perfect.

It is necessary for myopic children to wear glasses to prevent headaches, trouble reading or injuries. It is also important that schools invite doctors to test their students’ eyes.

If that is not possible, school teachers should at least encourage parents and children to have regular eye examinations and wear glasses. And parents should remember not only to limit the total screen time for their children, but also to encourage them to spend time outdoors.

小题1:What’s the aim of the study by the Australian research team ?

A．To find the reasons for myopia.

B．To find the ways to treat myopia.

C．To prove the bad effects of myopia.

D．To prove the prevalence of myopia.小题2:Why are there fewer children with myopia in Sydney than in Singapore ?

A．Because Sydney children watch less TV.

B．Because Sydney children have more eye resting time.

C．Because Sydney children use computers less.

D．Because Sydney children do more outdoor sports.小题3:What conclusion can we draw from the passage ?

A．Sydney children don’t study hard.

B．Singapore children do few exercises.

C．Outdoor activities do more good to eyes.

D．Room light does harm to children’s eyes.小题4:Which of the following statements is TRUE ?

A．Children should have eye tests as soon as they reach school age.

B．Doing outdoor activities with no glasses is good for myopia children.

C．Focusing on distant objects can help the eyes keep their original shape.

D．Children should limit their time in the sun in order to protect their eyes.

林火监测预报的方式有（）、（）、（）、（）。