well as the others, and photosynthesis rates bounced back to normal after the heat wave passed, Drake and his colleagues reported online in Global Change Biology.

　　The researchers think the Parramatta red gums were able to effectively sweat-even without photosynthesis-because they are particularly good at tapping into water deep in the soil. But if a heat wave and a severe drought(干旱)were to hit at the same time and the groundwater was exhausted, the trees may not be so lucky, Drake says.

　　Other scientists call the finding encouraging. "It's definitely good news," says Trevor Keenan, an ecologist at Lawrence Berkeley National Laboratory, who was not part of the study. "It would be very interesting to know how this translates to other species," he adds. Drake hopes to conduct similar experiments with trees common in North America.

3.How does one species of eucalyptus tree cope with extreme heat waves?

A.By releasing water. B.By blocking sunlight.

C.By absorbing groundwater. D.By reducing photosynthesis.

4.What did the researchers do during their study?

A.They grew all the trees in artificial temperatures.

B.They induced a heat wave in a dozen pods of trees.

C.They created climate-controlled surroundings for trees.

D.They varied trees' conditions in their natural environment.

5.The underlined phrase "ground to a near halt" in Paragraph 4 means "　　　".

A.continued B.substituted C.strengthened D.ceased

6.What can be inferred from the last two paragraphs?

A.Photosynthesis is necessary for the trees to sweat.

B.No further experiments will be done on other species.

C.Other species will be transplanted to North America.

D.Groundwater helps the trees survive the extreme heat.

II.书面表达

　　请阅读下面短文,并按照要求用英语写一篇150词左右的文章。

Recently, the State Administration of Cultural Heritage (SACH) issued a guidance to open cultural heritage buildings to the public, encouraging local governments, cultural heritage departments and organizations using or managing such buildings to better bring these buildings'