aix基础概念的问题，请教一下

首先是两道find命令对错题：

第一题：True or false? find's most important characteristic is its ability to
travel up through the file tree hierarchy.

第二题： True or false? When quoted metacharacters are used with find, the
shell will first expand the wildcard then pass control to find.


第三题：

有个文件，就是passwd.back：

root:!:0:0::/:/usr/bin/ksh
root:1:3:4:5:m:/p
root:2:9:3:8:n:q
daemon:!:1:1::/etc:
bin:!:2:2::/bin:
sys:!:3:3::/usr/sys:
adm:!:4:4::/var/adm:
uucp:!:5:5::/usr/lib/uucp:
guest:!:100:100::/home0/guest:
nobody:!:4294967294:4294967294::/:
lpd:!:9:4294967294::/:
lp:*:11:11::/var/spool/lp:/bin/false
invscout:*:6:12::/var/adm/invscout:/usr/bin/ksh
snapp:*:200:13:snapp login user:/usr/sbin/snapp:/usr/sbin/snappd
ipsec:*:201:1::/etc/ipsec:/usr/bin/ksh
nuucp:*:7:5:uucp login user:/var/spool/uucppublic:/usr/sbin/uucp/uucico
esaadmin:*:811:0::/home0/esaadmin:/usr/bin/ksh
jiang:!:202:0::/home0/jiang:/bin/bash
sshd:*:203:201::/var/empty:/usr/bin/ksh
ldap:*:204:1::/home0/ldap:/usr/bin/ksh

用grep命令列出uid在200-299之间的所有用户。