下图所示装置可用于测定空气中氧气的含量，实验前在集气瓶内加入少量水，并做上记号。下列选项中，正确的是    （ ）

在平面直角坐标系中，已知直线y=－ $\frac{3}{4}$ x+3与x轴、y轴分别交于A、B两点，点C(0，n)是y轴上一点，把坐标平面沿直线AC折叠，使点B刚好落在x轴上，则点C的坐标是(      )

你知道吗颜色？填一填。

赤橙黄绿青蓝紫

整体认读音节：____ ____ 前鼻韵母：____ 后鼻韵母：____ ____ ____

    The Abbey Road pedestrian crossing in Northern London is one of the world's most famous ____ it is on the cover of Beatles album. Now, the British government ____(put) it on the list of national heritage sites.

    ____ (normal), only buildings and other architectural sites get the award. It is the first time ____ a section of street became part of ____ (Britain) National Heritage. The crossing is near the Abbey Road studios ____the Beatles made most of their records. Today it can ____(see) around the world on a special webcam(网络摄像头). The studio building ____(it)became listed by British Heritage last February. The photographer of the picture said he only had 10 minutes ____(take) it. It became one of the most famous album covers of all times. The Abbey Road album was ____last one the Beatles completed before they broke up.