——Do you have any plans for this summer vacation?    ——I'm not sure. I ___ take a trip to Taiwan. 

阅读理解
    Tom lives in the UK. His friend Jack is in Dubai. He will go to see his friend. First he needs to go to London to take the plane.
    On Friday morning, Tom takes a bus to the train station. It takes Tom about 30 minutes to get there. Tom gets on the train at about 10 o'clock：The train leaves at 10：15. The train trip to London takes three hours. At lunchtime Tom gets to London. Tom eats a hamburger for lunch. Then he goes to the airport(机场)by subway. After about one hour,Tom gets to the airport. Tom gets on the plane at 8 o'clock in the evening. The trip takes a long time. Tom is tired(疲倦的)after a busy day. So he goes to sleep(睡觉). On Saturday morning, Tom gets to Dubai. He is very happy, because he will have a great time with his friend.

1998年9月23日，铱卫星通讯系统在美国和欧洲正式投入商业运行。原计划的铱卫星系统是在距地球表面780 km的太空轨道上建立的一个由77颗小卫星组成的星座，这些小卫星均匀分布在覆盖全球的7条轨道上，每条轨道上有11颗卫星。由于这一方案的卫星排列与化学元素铱原子核外77个电子围绕原子核运动的图景类似，所以简称为铱星系统。自然界中有两种铱的同位素，质量数分别为191和193，则                                          (        )

昆虫完全变态发育与不完全变态发育的区别是（    ）

铝石墨双离子电池是一种全新低成本、高效电池。原理为：AlLi+C_x(PF₆) $\underset{充电}{\overset{放电}{\rightleftharpoons }}$ Al+xC+Li⁺+PF₆^-。电池结构如图所示。下列说法正确的是（   ）