Broadleaved plants in the temperate zones begin to shed their leaves before winter because they cannot______.

A．What the man’s plans are for tonight.
B．Why the man does not want to play tennis.
C．Why they do not have time to play tennis after class today.
D．What time they can meet in the library.

A．She’s happy that the student center is getting more computers.
B．She’ll let the man use her computer to do statistics assignments.
C．She will take a statistics course in the student center soon.
D．She’d like to buy a computer very soon.