How many sensors can I connect through cc3000 wifi shield?

Im new to circuits. One of my friend told me that on Adafruit cc3000 wifi shield you can use limited pins for sensors as rest are acquired by shield itself so they cant be used. Is it true?
If so what is the way that I can connect my all my 4 sensors.
I'm trying to build a wireless weather station for my project.

I don't know the answer, but the place you should start is with the datasheet.

Why can't this "friend" simply tell you which pins are used?

Google is my friend.

On the CC3000 shield, we use the following pin connections

SCK - #13
MISO #12
MOSI #11
CS for CC3000 #10
CS for SD Card #4
IRQ #3