Passage One

What does the galaxy look like

A．If you were above it and look down on it, it would look like a flat and round watch.

B．If you looked at it from its edge, it would look like the Milky Way.

C．If you looked at it from its inside, it would look like a large watch.

D．If you looked up, it would look like a night sky.

真菌有酵母菌、霉菌等。霉菌和酵母菌可来自空气。真菌生存的最适宜温度为（）℃，最适宜的pH为（）。