上生物实验课时，小刚发现他所用的显微镜是目镜、物镜上分别标有5倍和10倍字样，则他所用显微镜的放大倍数为[ ]

A、5倍

B、10倍

C、15倍

D、50倍

Hydrogen is the fundamental element of the universe ______ it provides the building blocks from which the other elements are produced.

A．so that

B．but that

C．in that

D．provided that