题目内容
---How old is your grandpa this year , Tom ?
--- ___________. And we are planning a party for his ________ birthday.
A. ninety ; ninety B. ninetieth ; ninetieth
C. ninety ; ninetieth D. ninety ; ninetieth
C
【解析】
试题分析：句意：汤姆，你的爷爷今年多大年纪了？九十。我们为他的九十岁生日正筹划晚会。ninety90岁，年龄用基数词；his ninetieth birthday他的九十岁生日，要用序数词。故选C。
考点：考查数词。
Bats are amazing animals. There are many kinds of them. Most bats are black or grey in colour. And they have wings, too. Many people believed that bats couldn’t see. In fact, Bats can always find their way around very well. Usually, bats live in caves and trees. They can fly to their homes from far away. Some scientists said, “Bats can see with their ears.” Is it right? Most bats make a sound. The sound is too low for our ears to hear. They screech（尖叫） when they move around, and the echoes（回声）of these cries come back to their ears. In this way, they are able to tell where walls and other things are. Bats go out to eat at night. In the daytime they hang close together in their caves, trees or other dark places. Only when evening comes，they begin to come out and look for food, In the morning they come home to sleep until the next night. Some people think of bats as bad animals. In fact, they are very useful animals. Most of them catch bad insects（昆虫）for food. Some bats eat flowers and fruit as well.
Appearance | They are 76 or grey and have 77 . |
Homes | Most bats live in 78 and 79 . |
Diet | Most bats eat 80 and some may eat flowers and 81. |
Lifestyle | They 82 in the daytime and look for 83 during the night. |
How they find ways | They “see” with their 84 because they can make a 85 that we can’t hear. |