The farmers are only allowed to cut _____ tr
ees and cut them _____ for firewood once a year.
| A．down, up | B．up, down | C．off, across | D．down, out |
. Leaves are found on all kinds of trees, but they differ greatly ________ size and shape.
| A．on | B．from | C．by | D．in |
Reality is not the way you wish things to be, nor the way they appear to be, ___ the way they actually are.
| A．as | B．or | C．but | D．and |
People try to avoid public transportation delays by using their own cars, and this _____ further problems.
| A．in short | B．in case | C．in doubt | D．in turn |
Although ____ my opinion, the old professor didn’t come up with his own.
| A．against | B．on | C．for | D．in |
The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.
| A．after | B．before | C．since | D．when |