生产建筑陶瓷的乡镇污染严重，乌烟蔽日，曾经是闽南沿海的一大景观。经过一年多的治理，闽

下图是钠原子结构示意图。根据图可知钠原子中质子数为             ，在化学反应中钠原子容易           (填得失几个电子)，而变成             (用符号表示)。

男性，30岁，车祸2小时后来院，一般情况尚好，右小腿中上段皮裂伤14cm，软组织挫伤较重，胫骨折端有外露，出血不多。

此时最佳的处理方法是（）

A.清创术，骨折复位，外固定支架固定

B.清创术，骨折复位，钢板内固定

C.清创术，骨折复位，髓内针内固定

D.清创术，夹板固定

E.清创术，石膏管型固定

五四前后，为了扩大马克思主义的思想阵地， * * 党早期组织的成员同以梁启超、（）、张东苏、黄凌霜

Ship tourism to Antarctica is on the rise: More than 35,000 tourists are expected to visit Antarctic this summer. In 1992-1993, 6,750 visited Antarctica, according to the Antarctica Treaty. All of this tourism, however, is putting both tourists and the environment in great danger.

Among the tourist ships that visit the continent, the Explorer, a Canadian ship, was one of the first. Put to use in 1969, it was built to carry tourists to Antarctica. Last week, however, it became the first commercial passenger ship to sink beneath the waters. Fortunately, all of the passengers and crew members were rescued from the ship. However, the sunken ship endangered the Antarctic’s fragile(脆弱的) environment. The ship was estimated to be holding 48,000 gallons of fuel.

The accident was not unexpected. Both the US and UK had warned a conference of the Antarctic Treaty member countries in May that the tourism situation in this area was a potential disaster. The US said in a paper, people “should take a hard look at tourism issues now, especially those related to ship safety.” Although the Antarctic seas are relatively(相对地) calm, floating ice causes a potential threat to ships. The owner of the Explorer blamed the sinking on a fist-like hole in the ship created by ice.

Many of the other large ships now visiting Antarctica are not designed especially against thick ice. Such ships generally can only come to the continent in summer. But the tourist rush is pushing ships into dangerous situations. “The increasing number of ships operating in Antarctic means that the ship are under great pressure to get there in time for the key visiting sites,” the British government wrote in a paper at the meeting of member countries.

As a natural frontier, Antarctica is in a messy legal situation. There are no obvious answers as to who is responsible for dealing with the threat that tourist may cause to human life and the environment.

There is no coast guard for Antarctica. Do we want it to become Disneyland, or do we need some controls?

76. Which of the following is true according to this passage?

A. Antarctica tourism has a history of about 17 years

B. The number of tourists to the Antarctic is over 5 times as large as that of 17 years ago.

C. The tourism boom has caused holes in the floating ice in the Antarctic.

D. The Antarctica Treaty is responsible for the problem.

77. The sinking of the Explorer____________.

A. led to a conference about the tourism situation in the Antarctic.

B. was caused by the rough seas

C. had been predicted

D. did harm to the Antarctic.

78. It can be inferred from the passage that_________.

A. a Disneyland will be built in the Antarctic

B. fewer people are visiting the Antarctic because of the warnings given

C. not all the ships are suitable to go to the Antarctic

D. some ships take risks visiting the Antarctic in other seasons rather than in summer

79. In this passage, the writer suggests that___________.

A. people had better not make a tour of the Antarctic

B. ships to the Antarctic should be built strong enough

C. there should be legal controls over tourism in the Antarctic

D. the Antarctic’s environment is fragile

80. What attitude does the writer hold towards Antarctic tourism?

A. Supportive.     B. Positive.       C. Indifferent.        D. Anxious.

活性污泥发生膨胀的主要特征是什么？