It was when I got back to my apartment ________ I first came across my new neighbors.
A.who B.where
C.which D.that
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _______ explanations are hard to find.
A.alternative B.aggressive
C.ambiguous D.apparent
—I feel so nervous about the National English Speech Competition tomorrow.
— .
A.I really envy you B.Glad to hear that
C.Sounds great D.Take it easy
Directions：Write an English composition in around 150 words according to the instructions given below in Chinese.
为保护环境，政府提倡垃圾分类，但许多小区的落实情况不尽人意，请你写一封电子邮件向有关部门负责人反映这一现状，并提出合理建议。
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Directions：Translate the following sentences into English,using the words given in the brackets.
1.建议老年人晚上不要喝浓茶，以免睡不着。（in case）
2.在任何情况下，坚持原则、明辨是非都是明智之举。（sense）
3.下周五考试的那天碰巧有一场他们期待已久的音乐会，这令他们非常沮丧。（There）
4.是不是当她很难嚼东西的时候她才下定决心去那家朋友推荐的诊所看牙医的啊？（it）
Directions: Read the following passage. Summarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible.
Blowing a Few Tops
Ever stopped to consider the upside of volcanic eruptions? It’s not all death, destruction and hot liquid rock—scientists have a plan to cool the planet by simulating one such eruption.
Solar geoengineering involves simulating a volcano by spraying aerosols(气溶胶) into the atmosphere. When they combine with oxygen, droplets of sulfuric acid (硫酸) form. These droplets reflect sunlight away from Earth, cooling the planet. All good in theory, but the consequences are largely unknown and a few could be disastrous. In a study recently published in Nature Communications, researchers led by Anthony Jones, a climate scientist from the University of Exeter, found that using this technology in the Northern Hemisphere could reduce the number of tropical winds hitting the U.S. and Caribbean. But there's an annoying exchange: more winds in the Southern Hemisphere and a drought across the Sahel region of Africa. That’s because the entire climate system is linked—disrupting one region will invariably affect another. How would a nation react if another was causing its weather to get much worse? Would that be an act of war?
There is, however, a case for using solar geoengineering on a global scale. Jones says it could be used to “take the edge off” the temperature increases scientists are predicting. It could be used while the world searches for more effective strategies.
The study also highlights a far bigger problem with solar geoengineering: its complete lack of regulation. “There’s nothing that could stop one country just doing it,” Jones says. “You only need about 100 aircraft with three flights per day. It would cost $1 billion to $10 billion per year.” He adds, “It’s deeply disturbing that we have this technology that could have such a massive influence on the climate, yet there’s just no regulation to stop countries or even organizations from doing it.”
Jones cautions that there is much about the climate system we do not understand, as well as far more work that will need to be done before solar geoengineering is considered safe—or too dangerous to even discuss.
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