奇速英语官网—英语在线学习平台_让学英语更快乐_更快速

In 2023, Shanghai started its first full survey of local biodiversity. These days, scientists found exciting results in Chongming District. They discovered three new species: one new to China and two new to Shanghai.

One new species is called Surirella paranavis. It is a type of algae (藻). This algae was never recorded in China before. It lives in slightly salty water and is very sensitive to environmental changes. Its body is S-shaped and covered with tiny lines.

Two new midge (摇蚊) species were also found. They are Nanocladius rectinervis and Corynoneura parvula. These midges are new to Shanghai. Midges look like mosquitoes but are harmless. Their mouths cannot bite. Most midge larvae (幼虫) live in mud and eat dead plants or bacteria. They help break down waste and improve water quality.

Last year, the survey team checked 46 water areas in Chongming. They studied big lakes, small rivers, and even some rivers in Jiangsu Province. Scientists collected mud samples and used special nets to catch tiny creatures.

These discoveries show Chongming’s water ecosystems are rich and complex. Some species might have lived here for years without being noticed. More studies will help us understand why they appeared here.

1.1. What is the main purpose of Shanghai’s 2023 survey?

A To build new water parks.

B To study local plants and animals.

C To clean polluted rivers.

D To catch dangerous insects.

解析：选B。B 推理判断题。根据首段的“first full survey of local biodiversity”可知，这是上海首次全面的生物多样性调查，即是为了摸清生物多样性的现状。故选B。

2.2. The word “sensitive” in Para. 2 probably means ______.

A easily affected

B very active

C really strong

D very colorful

解析：选A。A 词义猜测题。根据第二段的“lives in slightly salty water”和“covered with tiny lines”可知，该藻类生活在微咸水中，表面有细密纹路。特殊的生物环境暗示其对环境有特定要求，精细结构表明它形态组成复杂脆弱，环境细微变化易致藻体改变。故选A。

3.3. Why are midges important to water ecosystems?

A They make water taste better.

B They eat harmful fish.

C They clean the water.

D They produce oxygen.

解析：选C。C 细节理解题。根据第三段的“help break down waste and improve water quality”可知，摇蚊帮助分解废物，可以改善水质。故选C。

4.4. The survey included water areas in ______.

A Shanghai only

B Shanghai and Jiangsu

C mountains and forests

D underground caves

解析：选B。B 细节理解题。根据第四段的“studied... even some rivers in Jiangsu Province”可知，调查范围包括上海的江河，还包括江苏辖区的部分河道。故选B。

5.5. What does the last paragraph mainly tell us?

A Chongming needs more tourists.

B The discoveries are meaningless.

C The water ecosystem is simple.

D More research will be done.

解析：选D。D 段落大意题。根据末段核心句“More studies will help us understand...”可推知，最后一段主要是介绍未来会有更多的相关研究。故选D。