San Francisco has many museums. You can visit one and learn something new, We have art, science, history and other special museums. Some museums are open every day. Some are only open on certain days. Many museums are expensive, and others are free. But some of the expensive ones have free days. May museums have websites. The websites usually have information about the things you can see in the museums.
On a museum's website you can get information about .ticket prices and free days. You can also know where the museum is and when it is open. Sometimes the information is on the first page, and it's very easy for you to find. But sometimes you have to click (点击) on the words like Visit Information, or About to find the information. That will be hard work for you.
小题1:San Francisco has many museums for you visit and .
A．learn something new
B．play computer games
C．watch the movies
D．click on Information小题2:Some museums in San Francisco are open every day, but some are only open .
A．on weekdays
B．on weekends
C．on certain days
D．on holidays小题3:Many museums have with information about the things you can see in them.
A．ticket prices
B．their websites
C．open hours
D．free days
Z(g)(未配平)，各物质的物质的量随时间变化的关系如图a所示。其他条件相同，温度分别为T1℃、T2℃时发生反应，X的物质的量随时间变化的关系如图b所示。下列叙述正确的是（ ）