The air in the hill must be        . Let's go and enjoy it.

—What ________ is the coat?

—Yellow.

根据短文内容，用正确的信息填空，完成下面的表格，每空一词。

    Service on the 102-km high-speed railway between Shenzhen and Guangzhou started on December 26, 2011. A non-stop trip between the Guangzhou South Station and the Shenzhen North Station takes 35 minutes at full speed.

    The train runs at the highest speed of 300 km per hour. All 36 pairs of trains run every day. A one-way first-class ticket costs 100 yuan. A second-class one costs 75 yuan, 5 yuan cheaper than a second-class ticket on the slower line.

    A high-speed train has 556 seats, including 16 seats in the VIP rooms and 50 in the first-class carriage (车厢). It offers more advanced facilities (先进的设施). For example, the seats are more comfortable, there are toilets for the disabled (残疾人), and there are power outlets (电源插座) in the first-class carriage.

    The high-speed service between Guangzhou and Shenzhen will be a convenient choice for many people. “I won't need to travel to the Guangzhou East Station to take a train to Shenzhen,” said Wang Yi, who lives in Panyu district in Guangzhou.

    Many people still prefer the slower trains, because the terminals (终点站) of the high-speed trains are far away from the centres of both cities. “I would not like to take a high-speed train to Shenzhen. I live in the centre of Guangzhou. First I have to get to the Guangzhou South Station. It is a waste of time for me,” said Zhang Lu.

High⁃speed railway between Shenzhen and Guangzhou
On December 26, 2011, the high-speed railway between Shenzhen and Guangzhou started to be in service. It only takes ____minutes to get to Shenzhen from Guangzhou.
Speed	The train runs at the ____speed of 300 km per hour.
Ticket price	●A____first-class ticket costs 100 yuan. ●A one-way second-class one costs 75 yuan, 5 yuan ____than a second-class ticket on the slower train.
Service	●All 36 pairs of trains run between Shenzhen and Guangzhou ____. ●A high-speed train has 556 seats, including 16 seats in the VIP rooms and 50 in the ____carriage. ●It ____more advanced facilities for passengers. The seats in the first-class carriage are more ____, and there are toilets for the disabled and power outlets.
Opinions	●Wang Yi said he could take the high-speed train to Shenzhen from Panyu easily. ●Zhang Lu said it was a waste of____for him to take the high-speed train to Shenzhen because the Guangzhou South Station is far away from the ____of Guangzhou.

在学校的联欢晚会上，老师做了神奇的表演，向装有不同固体的试管中滴入适量不同的无色液体，产生了不同的现象。老师让同学们参与互动进行猜想：
（1）若固体为白色粉末，加液体后产生了能使澄清石灰水变浑浊的气体．则固体可能是（任写一种，下同）____ ，液体可能是____。
（2）若固体为白色粉末，加液体后无气体产生，所得液体温度降低．则固体可能是____ ， 液体可能是____。
（3）若固体为黑色粉末，加液体后有气体产生，则黑色粉末可能是____ ， 反应的化学方程式为____。

下列关于误差的说法中，正确的是(   )