下列各组中，除哪一组外，都是单细胞生物（ ） A．酵母菌、衣藻 B．草履虫、水蚤 发布时间：2017-04-21 05:42 │ 来源：www.tikuol.com 题型：选择题 问题： 下列各组中，除哪一组外，都是单细胞生物（ ）A．酵母菌、衣藻B．草履虫、水蚤C．结核杆菌、肺炎双球菌D．甲烷细菌、醋酸杆菌
题型：选择题 阅读理解。 Not long ago, China decided to build a bridge to link Zhuhai, Hong Kong and Macao. People will finishbuilding it in 2016. It will be the world's longest sea-crossing bridge! The Y-shaped bridge is about 50 kilometers altogether. 35 kilometers of it will be over water. Officials say the bridge we use will last in good condition for 120 years. It can handle big earthquakes as well as strong winds. And it will be all right even if it is hit by a 300,000-ton ship. With six car lanes, a car can go as fast as 100 km per hour on the bridge. It will only take 30 minutes to drive from Zhuhai or Macao to Hong Kong. Some people worry that the building of the bridge will pollute the sea and hurt sea animals. Officialssay they will protect the ocean. China hopes that the bridge can bring the mainland, Hong Kong and Macao closer. Building the bridgewill cost about ￥73 billion. Hong Kong, Macao and the mainland will share the cost. 1. It will take China ______ years to build the bridge.[ ]A. 3B. 6 C. 10D. 14 2. The shape of the bridge is like the letter "______". [ ]A. "H" B. "M" C. "Y" D. "V" 3. The bridge is about ______ long. [ ]A. 50 kilometersB. 36 kilometers C. 100 kilometers D. 120 kilometers 4. What do some people worry about? [ ]A. The bridge is too long. B. It will take a long time to build it. C. Officials will protect the ocean. D. The building of the bridge will pollute the sea and hurt sea animals. 5. Who will share the cost of the building of the bridge? [ ]A. Hong Kong B. Macao C. The mainland D. A, B and C 查看答案
题型：选择题 关于受精过程的叙述正确的是[ ]A．获能后的精子与卵子相遇后，释放顶体酶穿过透明带进入放射冠B．透明带反应是防止多精入卵的第一道屏障C．精子与卵黄膜相互融合，精子入卵D．雄原核形成的同时，卵子完成减数第二次分裂 查看答案