As the population of the world is growing at the disturbing rate of 10，000 people an hour, nature is beginning to ________ us.
A. turn against B. turn up C. turn off D. turn around
The society can remain good as long as we are willing to fight for it—and to fight against whatever imperfections ________ exist.
A. shall B. may C. should D. would
Fishing in shallow water in autumn, ________ the water temperature is relatively high, does make sense.
A. when B. which C. as D. where
China will ________ cooperation with countries and regions participating in the Belt and Road Initiative.
A. approve B. justify C. enhance D. tighten
Effective weight management requires a longterm ________ in order to lose weight for good.
A. establishment B. commitment C. tournament D. assessment
听下面一段独白，回答以下小题。
1.When did people begin to take part in adventure racing in large numbers?
A. About 100 years ago. B. In the late 1970s. C. In the early 1990s.
2.What makes an adventure race more challenging?
A. The combination with different activities.
B. The area it goes through.
C. The long distance.
3.How long does it take to do the South Island race?
A. One day. B. Three days. C. Ten days.
4.What's the most difficult in long races according to the speaker?
A. Staying awake.
B. Saving food and drinks.
C. Carrying all the needed things.
