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【单选题】
Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel 【26】______ the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other 【27】______ of transport. These 【28】______ make it possible for boats to travel 【29】______ ports along the coast without being 【30】______ to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their 【31】______ a thousand miles shorter. Other canals permit boats to reach cities that are not 【32】______ on the coast, still other canals 【33】______ lands where there is too much water, help to 【34】______ fields where there is not enough water, and 【35】______ water power for factories and mills. The size of a canal 【36】______ on the kind of boats going through it. The canal must be wide enough to permit two of the largest boats using it to 【37】______ each other easily. It must be deep enough to leave about two feet of water 【38】______ the keel of the largest boat using the canal. When the planet Mars was first 【39】______ through a telescope, people saw that the round disk of the planet was criss-crossed by a 【40】______ of strange blue-green lines. These were called 'canals' 【41】______ they looked the same as canals on earth 【42】______ are viewed from an airplane. However, scientists are now 【43】______ that the Martian phenomena are really not canals. The photographs 【44】______ from space-ships have helped us to 【45】______ the truth about the Martia 'canals'. 【26】
A.
off
B.
with
C.
to
D.
by
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参考答案:
举一反三
【单选题】以下关于刷牙方法的叙述不正确的是:
A.
刷牙时应将牙刷的毛面与牙齿呈90°
B.
将牙刷顶端轻轻防于牙沟部位
C.
以快速的环形来回刷动
D.
每次只刷2~3个牙齿
E.
用牙刷毛面的顶部以环形方式刷洗前排牙齿的内面
【单选题】They are from . They are .Germany is a European country.
A.
Germany;Germans
B.
German; Germen
C.
German;Germany
D.
Germany;Germen
【判断题】STM32内核为ARM公司为要求高性能、低成本、低功 耗的嵌入式应用专门设计的Cortex-M内核。
A.
正确
B.
错误
【单选题】Germany is ______European country.
A.
a
B.
an
C.
the
【单选题】若等比数列{a n }的公比q<0,前n项和为S n ,则S 8 a 9 与S 9 a 8 的大小关系是(  )
A.
S 8 a 9 >S 9 a 8
B.
S 8 a 9 <S 9 a 8
C.
S 8 a 9 =S 9 a 8
D.
不确定
【单选题】以下关于刷牙方法的叙述不正确的是
A.
刷牙时应将牙签的毛面与牙齿呈90°
B.
将牙签的毛面轻放于牙沟部位
C.
以快速的环形来回刷动
D.
每次只刷2-3ge 牙齿
E.
用牙签毛面的顶部以环形方式刷洗前排牙齿的内面
【单选题】DNS用来解析下列各项中的哪一项( )。
A.
IP地址和MAC地址
B.
用户名和IP地址
C.
TCP名字和地址
D.
主机名和传输地址
【单选题】胃腺壁细胞合成盐酸的部位是( )
A.
滑面内质网
B.
粗面内质网
C.
高尔基复合体
D.
小管泡系
E.
细胞内分泌小管
【单选题】劳务派遣的临时性工作岗位是指存续时间不超过( )的岗位。
A.
三个月
B.
五个月
C.
六个月
D.
一年
【单选题】DNS用来解析下列各项中的哪一项( )。
A.
IP 地址和 MAC 地址
B.
主机名和 IP 地址
C.
TCP 名字和地址
D.
主机名和传输层地址
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