[单项选择]We have no time to lose. Let's ______on the task before us.
A. enter
B. impose
C. concentrate
D. overwork

[单项选择]We have no time to lose. Let's ______ on the task before us.
A. enter
B. impose
C. concentrate
D. overwork

[单项选择]We have no time to lose. Let's ______on the task before us.
A. enter
B. impose
C. concentrate
D. overwork

[单项选择]We could not have fulfilled the task in time if it（）for their help.
A. was not
B. is not
C. had not been
D. has not been

[单项选择]As it is a difficult task，we have to discuss it beforehand．
A. 由于这工作涉及到上山，我们应该先商量。
B. 因为这件事办起来很困难，所以我们得事先讨论一下。
C. 既然这件工作就是爬山，我们先干然后讨论。
D. 当办这件事很费力时，我们就得先讨论如何办。

[单项选择]Let's go and have a drink. We've got ______ time before the train leaves


A. a few
B. a little
C. little

[单项选择]

Passage Four
At one time or another we have all stopped to think about the weather. Some days the weather is good. Some days the weather is bad. Still, there are days when the weather seems to change from hour to hour. A day that starts out fine might not stay that way. Sometimes a day that seems bad turns out better than you thought it would. There are ways of understanding the weather. One way is to study the clouds.
No two clouds are ever alike. But it is still possible to group clouds and to give them names. We can recognize the different kinds of clouds and watch them for signs of changing weather.
As a rule, the higher the clouds, the better the weather. And the lower the clouds, the worse the weather is likely to be. To predict the weather, there are three things about clouds you should look for: movement, color, and change.
Clouds can tell you if storm is on the way. For example, small feathery cirrus clouds (卷云) can become thick and
A. If clouds are high, there will be bad weather.
B. The color of clouds is a factor to help predict the weather.
C. If the weather is good, the clouds must be very low.
D. To study clouds is the only way to understand the weather.