下列各句中，划线的成语使用恰当的一项是(   ) 

量筒的用途是____，使用时，量筒必须____，视线要跟____．保持水平．如图中量筒内液体的读数是____mL．

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分式方程$\frac{1}{x-1}-\frac{2}{x+1}=\frac{4}{x^2-1}$的解是（     ）

A

    When you travel in England you can't miss the visit to Windsor Castle, the family home to british kings and queens for over 1,000 year.

    Opening Times at Windsor Castle:

    The castle opening hours

    ◆1 Mar 2018-31 Oct 2018(Monday-Sunday 09: 30-17: 15)

    ◆1 Nov 2018-28 Feb 2019(Monday-Sunday 09: 45-16: 15)

    Prices

    Adult ticket:￡21.20

    Family ticket(2 adults &3 children between 5 and 17 years old ): ￡54.70

    Senior/ College student ticket: ￡19.30

    Under 17 years old /Disabled ticket: ￡12. 30

    Castle Closing Dates

    The castle will be closed on the following dates

    ◆17&18 Jun 2018

    ◆12 Oct 2018

     Top tips:

    ◆Buy your ticket on the Internet before you arrive to save some time.

    ◆If you want to see the Changing of the Guard ceremony, get to the Castle grounds at 11: 00. During the summer it happens every day, if the weather is good.